HVAC SYSTEM COVID PROCEDURES

August 17, 2020

Prepared by:

Johnson Roberts Associates 15 Properzi Way Somerville, MA 02143

Prepared for: City of Cambridge

Executive Summary

The HVAC COVID procedures are a compilation of Industry Standards and CDC recommendations. However, it should be noted that good PPE (personal protective equipment), social distancing, hand washing/hygiene, and surface cleaning and disinfection strategies should be performed with HVAC system measures, as studies have shown that diseases are easily transmitted via direct person to person contact, contact from inanimate objects (e.g. room furniture, door and door knob surfaces) and through hand to mucous membrane (e.g. those in nose, mouth and eyes) contact than through aerosol transmission via a building’s HVAC system.

Prior to re-occupying buildings, it is recommended that existing building HVAC systems are evaluated to ensure the HVAC system is in proper working order and to determine if the existing system or its associated control operation can be modified as part of a HVAC system mitigation strategy. Any identified deficiencies should be repaired and corrected, and if the building HVAC system is a good candidate for modifications those measures should be implemented.

In general HVAC system mitigation strategies should include the following recommendations: 1. Increase Outdoor Air. The OA increase must be within Unit's capacity in order to provide adequate heating or cooling so Thermal Comfort is not negatively impacted. Also use caution when increasing OA in polluted areas (e.g. High Traffic/City areas) and during times of high pollen counts. 2. Disable Demand Control Ventilation where present. 3. Utilize high efficiency MERV-13 filtration for most air handling and rooftop units. Potentially use higher Filter efficiency if the unit (fan power and associated filter rack) can accommodate. Electro- static filters may also be an option. Terminal Equipment units may not be able to accommodate higher filtration levels due to their available fan horsepower, i.e.; unit ventilators. 4. Seal edges of Filter sections with sheetmetal and foil type sheetmetal tape to avoid bypass of filters 5. Change Filters more often; particularly during time of high pollen counts. 6. Operate system in occupied mode for longer periods. 7. Consider installing separate Portable Room HEPA Filter Units. (Manufacturers include: MAFNA Heal Aire) 8. Consider installing UV (ultra-violet) emitters. Air Handling, Duct mounted or Upper Room terminal UV filters (Manufacturers include: uvresources.com; Intellipure; others) are available. For Upper Room type units installed in spaces with large ceiling heights, consider also using de-stratification fans to improve effectiveness of UV filters. 9. Consider supply side ductwork distribution cleaning.

The above HVAC system modifications should be done on a building by building and zone/system by zone/system basis as not all buildings’ and building area HVAC systems are not necessarily the same as outlined in HVAC Systems Overview.

Included in these procedures is building flushout period and calculated air exchanges per hour tabulations. Typical spaces have been used as the buildings were designed with the similar outside air requirements for each space/room type i.e.; classroom, office etc. The information for air changes were taken from existing drawings, balancing reports and other studies. We recommend that a Balancing Contractor verify the ventilation air flow for each type of space/room.

Executive Summary

The Sequence of Operations included are specific to each building as HVAC systems are not typical.

Recommendations are included at the end of the Sequence of Operations.

Cleaning and disinfection procedures for COVID are included at the end of HVAC Procedures for each school.

Executive Summary

SCHOOL INDEX

CAMBRIDGEPORT SCHOOL ...... 1 AMIGOS SCHOOL JK-8 ...... 7 JOHN M. TOBIN ELEMENTARY SCHOOL ...... 12 KENNEDY LONGFELLOW SCHOOL ...... 17 MARIA L. BALDWIN SCHOOL ...... 24 HAGGERTY SCHOOL ...... 30 LONGFELLOW COMMUNITY SCHOOL ...... 36 FLETCHER MAYNARD ACADEMY SCHOOL ...... 42 DR. MARTIN LUTHER KING, JR. SCHOOL ...... 48 KING OPEN & CAMBRIDGE STREET UPPER SCHOOLS ...... 54 CAMBRIDGE, RIDGE & LATIN SCHOOL ...... 61 WAR MEMORIAL RECREATION CENTER ...... 67 MORSE SCHOOL ...... 73 PEABODY SCHOOL ...... 79 GRAHAM & PARKS SCHOOL ...... 85 CLEANING AND DISINFECTING PROCEDURES ...... 91

School Index

CAMBRIDGEPORT SCHOOL 89 Elm St. Cambridge, MA 02139

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CAMBRIDGEPORT SCHOOL 89 Elm St. Cambridge, MA 02139

TABLE OF CONTENTS

HVAC SYSTEM OVERVIEW ...... 3 SEQUENCES OF OPERATION: ...... 4 AIR CHANGE CALCULATIONS: ...... 5 MIXED AIR CALCULATOR FOR H&V UNITS ...... 6

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HVAC SYSTEM OVERVIEW

HVAC SYSTEM OVERVIEW

Date: Monday, August 3, 2020 Building Name: Cambridgeport School Location: 89 Elm Street

AREA/ROOM HVAC SYSTEM TYPE FILTER REQUIRED FLUSHOUT OPERATION MERV 10 prefilter, MERV 13 bag Office VAV, heating only filter from central AHU 29.9 Days System Type 1

Gymnasium Single zone HV. heating only, wall radiators MERV 13 filter 29.9 Days System Type 1 MERV 10 prefilter, MERV 13 bag Cafeteria VAV, heating only w/ fin tube filter from central AHU 29.9 Days System Type 1 MERV 10 prefilter, MERV 13 bag Kitchen VAV, heating only w/ fintube filter from central AHU 29.9 Days System Type 1 MERV 10 prefilter, MERV 13 bag Typical Classroom VAV, heating only w/ fin tube, window AC. filter from central AHU 29.9 Days System Type 1

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SEQUENCES OF OPERATION:

System Type 1 Re-circulation style air-handling unit with heating, supply fan, and separate associated return fan system 1. Unit shall operate in occupied mode 24/7 for Building Flushout. 2. Supply Fan shall start and continue to run at full design speed. HV-1 to be increased for 47,800 CFM. 3. Outside Air Damper & Re-circulation Air Damper are fixed and ventilation airflow to mix with the re- circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Heating Section coil shall modulate to maintain discharge air temperature. 6. Unit shall run continuously to deliver constant ventilation to the spaces. 7. Unit Freeze-stat, damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 8. Gymnasium unit shall be balanced for 2,200 CFM outside air and 5,300 CFM return air. 9. VAV boxes shall be set at maximum design air flow (not max rated). 10. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 11. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy. Hot Water Boiler Systems: 1. Provide water inhibitors and 20% glycol by volume and testing to ensure proper water treatment levels are maintained. 20% glycol will achieve 10 deg. F burst protection. 2. Check control system and control devices for proper operation. 3. Check pumps and variable-frequency drives (where installed) for proper operation. 4. For natural gas systems, check gas pressure, gas valve operation, combustion flue gas venting and combustion air systems (including combustion air fans if installed) 5. Verify proper operation of all safety devices. 6. If necessary, vent air from distribution system high points. 7. Verify expansion/compression tank pressures to ensure proper operations. 8. Verify operating temperature for 200 deg. F supply temperature. The original design requires 200 deg. F boiler water temperature. Further Recommendations: 1. Install portable HEPA filters in each space where ventilation rate is less than 2.0 or filter MERV Rating is less than MERV-13. Based upon the calculation for typical spaces each occupied space is recommended to have a portable HEPA filter with 400 CFM of recirculation air. We recommend the HEPA filters run 2 hours prior to occupancy and during occupancy. 2. Consider installation of UV-C filters on the supply side of H&V units. We recommend the H&V units run 2 hours prior to occupancy and during occupancy. 3. Increasing humidity in winter to 40% will require a duct mounted humidifier or space type humidifier.

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AIR CHANGE CALCULATIONS:

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MIXED AIR CALCULATOR FOR H&V UNITS

HV-1

HV-2

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AMIGOS SCHOOL JK-8 15 Upton Street Cambridge, MA 02139

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AMIGOS SCHOOL JK-8 15 Upton Street Cambridge, MA 02139

TABLE OF CONTENTS

HVAC SYSTEM OVERVIEW ...... Error! Bookmark not defined. SEQUENCES OF OPERATION: ...... Error! Bookmark not defined. AIR CHANGE CALCULATIONS: ...... Error! Bookmark not defined.

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HVAC SYSTEM OVERVIEW

HVAC SYSTEM OVERVIEW

Date: Thursday, August 6, 2020 Building Name: Amigos School JK-8 Location: 15 Upton Street

AREA/ROOM HVAC SYSTEM TYPE FILTER REQUIRED FLUSHOUT OPERATION

Office N/A MERV 13 filter 20.1 Days System Type 1

Gymnasium Single zone HV. heating only MERV 13 filter 20.1 Days System Type 1

Cafeteria Constant Volume, heating only MERV 13 filter 20.1 Days System Type 1

Kitchen Constant Volume, heating only MERV 13 filter 20.1 Days System Type 1

Typical Classroom Constant Volume, heating only MERV 13 filter 20.1 Days System Type 1

Library Constant Volume MERV 13 filter 20.1 Days System Type 1

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SEQUENCES OF OPERATION:

System Type 1 Dedicated outside style air-handling unit with heating, supply fan, and separate return fan 1. Unit shall operate in occupied mode 24/7 for Building Flushout. 2. Supply Fan shall start and continue to run at full design speed. HV-1 to remain at 14,000 CFM. 3. Outside Air Damper ventilation airflow shall be full open. 4. Associated return fan shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Heating Section coil shall modulate to maintain discharge air temperature. 6. Unit shall run continuous to deliver constant ventilation to the spaces. 7. Unit Freeze-stat, damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 8. Gymnasium unit (HV-2) shall remain at 5,000 CFM. No balancing required. 9. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 10. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy. Hot Water Boiler Systems: 1. Insure existing heating water has water inhibitors, a minimum of 20% glycol by volume. 2. Check control system and control devices for proper operation. 3. Check pumps and variable-frequency drives (where installed) for proper operation. 4. For natural gas systems, check gas pressure, gas valve operation, combustion flue gas venting and combustion air systems (including combustion air fans if installed) 5. Verify proper operation of all safety devices. 6. If necessary, vent air from distribution system high points. 7. Verify expansion/compression tank pressures to ensure proper operations. 8. Verify operating temperature of original design. Further Recommendations: 1. Install portable HEPA filters in each space where ventilation rate is less than 2.0 or filter MERV Rating is less than MERV-13. Based upon the calculation for typical spaces each occupied space is recommended to have a portable HEPA filter with 400 CFM of recirculation air. We recommend the HEPA filters run 2 hours prior to occupancy and during occupancy. 2. Increasing humidity in winter to 40% will require a duct mounted humidifier or space type humidifier.

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AIR CHANGE CALCULATIONS:

Note: Kitchen area is removed from the average number above.

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JOHN M. TOBIN ELEMENTARY SCHOOL 197 Vassal Lane Cambridge, MA 02138

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JOHN M TOBIN ELEMENTARY SCHOOL 197 Vassal Lane Cambridge, MA 02138

TABLE OF CONTENTS

HVAC SYSTEM OVERVIEW ...... 87 SEQUENCES OF OPERATION: ...... 88 AIR CHANGE CALCULATIONS: ...... 90

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HVAC SYSTEM OVERVIEW

HVAC SYSTEM OVERVIEW

Date: Thursday, August 5, 2020 Building Name: John M. Tobin Elementary School Location: 197 Vassal Lane

AREA/ROOM HVAC SYSTEM TYPE FILTER REQUIRED FLUSHOUT OPERATION

Office Constant Volume AC Unit w/ Elec Heat MERV 5 – 2” Filter 16.4 Days System Type 2

Gymnasium H&V Unit w/ Elec Heat MERV 5 – 2” Filter 16.4 Days System Type 2 UV’s w/ AC & Elec Heat MERV 5 – 1” Filter for UV’s Cafeteria Constant Volume AC Unit w/ Elec Heat MERV 5 – 2” Filter for AC Unit 16.4 Days System Type 2

Kitchen H&V Unit w/ Elec Heat MERV 5 – 2” Filter 16.4 Days System Type 2

Typical Classroom UV’s w/ AC & Elec Heat MERV 5 – 1” Filter 16.4 Days System Type 2

Auditorium Constant Volume AC Unit w/ Elec Heat MERV 5 – 2” Filter for AC Unit 16.4 Days System Type 2

Library UV’s w/ AC & Elec Heat MERV 5 – 1” Filter 16.4 Days System Type 2

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SEQUENCES OF OPERATION:

System Type 2 Re-circulation style air conditioning unit with heating, and supply fan 1. Unit shall operate in occupied mode 24/7 for Building Flushout. 2. Supply Fan shall start and continue to run at full design speed. 3. Outside Air Damper & Re-circulation Air Damper shall be fixed and ventilation airflow to mix with the re-circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Electric Heating Section shall modulate to maintain discharge air temperature. 6. Unit shall run constantly to deliver constant ventilation to the spaces. 7. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 8. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 9. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy. Unit Ventilator & Separate Associated Exhaust System: 1. Unit shall operate in occupied mode 24/7 for building flushout. 2. Supply fan shall start or continue to run at full design speed. 3. Face & Bypass dampers (where applicable) shall modulate to max occupied position to allow the proper ventilation airflow to mix with the re-circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly-positive space pressure. 5. Electric Heating coil shall modulate as delegated by the unit controller to maintain the discharge air temperature set-point when/if there is a call for heating from the space temperature sensor. 6. Unit shall run constantly to deliver constant ventilation to the space. 7. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 8. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy. Further Recommendations: 1. Install portable HEPA filters in each space where ventilation rate is less than 2.0 or filter MERV Rating is less than MERV-13. Based upon the calculation for typical spaces each occupied space is recommended to have a portable HEPA filter with 400 CFM of recirculation air. We recommend the HEPA filters run 2 hours prior to occupancy and during occupancy. 2. Consider installation of UV-C filters on the supply side of HVAC units. We recommend the HVAC units run 2 hours prior to occupancy and during occupancy. 3. Increasing humidity in winter to 40% will require a duct mounted humidifier or space type humidifier.

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AIR CHANGE CALCULATIONS:

Note: Kitchen area is removed from the average number above.

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KENNEDY LONGFELLOW SCHOOL 158 Spring St. Cambridge, MA 02139

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KENNEDY LONGFELLOW SCHOOL 158 Spring St. Cambridge, MA 02139

TABLE OF CONTENTS

HVAC SYSTEM OVERVIEW ...... Error! Bookmark not defined. SEQUENCES OF OPERATION: ...... Error! Bookmark not defined. AIR CHANGE CALCULATIONS: ...... Error! Bookmark not defined. MIXED AIR CALCULATOR FOR AUDITORIUM UNIT ...... 23

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HVAC SYSTEM OVERVIEW

HVAC SYSTEM OVERVIEW

Date: Monday, August 3, 2020 Building Name: Kennedy Longfellow School Location: 158 Spring Street

AREA/ROOM HVAC SYSTEM TYPE FILTER REQUIRED FLUSHOUT OPERATION CAV from central air handling unit with HW heating and DX cooling, and duct mounted MERV 10 prefilter, MERV 13 bag Office reheat coils. filter from central AHU 23.5 Days System Type 2 Single zone air handling unit with hot water MERV 10 prefilter, MERV 13 bag Gymnasium heating only, wall radiators filter from central AHU 23.5 Days System Type 1 Single zone air handling unit with HW heating MERV 10 prefilter, MERV 13 bag Cafeteria/Kitchen and DX cooling filter from central AHU 23.5 Days System Type 1 Single zone air handling unit with HW heating MERV 10 prefilter, MERV 13 bag Auditorium and DX cooling filter from central AHU 23.5 Days System Type 1 CAV from central air handling unit with HW heating and DX cooling, and duct mounted MERV 10 prefilter, MERV 13 bag First Floor Classroom reheat coils. filter from central AHU 23.5 Days System Type 2 CAV from central air handling unit with HW Second/Third Floor heating and DX cooling, and perimeter induction MERV 10 prefilter, MERV 13 bag Classroom unit w/ HW coils. filter from central AHU 23.5 Days System Type 2

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SEQUENCES OF OPERATION:

System Type 1: Re-circulation style air-handling unit with heating (AC-3, AC-4, & HV-6), cooling (AC- 3 & AC-4), supply fan, and associated return fan system 1. Unit shall operate in occupied mode 24/7 for building flushout. 2. Supply fan shall start and continue to run at full design speed. 3. Outside Air Damper & Re-circulation Air Damper are fixed and ventilation airflow to mix with the re- circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Heating or cooling coil shall modulate to maintain discharge air temperature. 6. Unit shall run continuously to deliver constant ventilation to the spaces. 7. Unit Freeze-stat, damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 8. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 9. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy 10. Air handling units need to match space air exchange calculator. 30% outside air shall be verified for each unit. 11. Owner to monitor discharge and space temp. Reduce outdoor air qty should space temp fall below low end temperature value of occupant comfort range ie 67 degrees or ahu discharge temp fall below 45 degrees.

System Type 2: Air Handling Unit Reheat Coil & Induction Unit Systems (AC-1, AC-2, & AC-5) 1. Units shall operate 24/7 in occupied mode. 2. Outside air damper shall open to its max position allowed by the unit’s capacity. 3. The exhaust damper position (where applicable) shall match the outside air damper position. 4. The recirculation damper shall be set to its minimum position. 5. The supply fan shall start and continue to run at full design speed. 6. The exhaust fan (where applicable) shall start and continue to run to match the incoming outside air based on fan speed (Hz) of the supply fan. a slight offset of 10% or less shall be provided to ensure a positive pressure is maintained within the building. 7. The hot water heating coil, or direct expansion cooling coiling section shall modulate to maintain the air handling unit discharge air temperature. 8. Air handling units need to match space air exchange calculator. 30% outside air shall be verified for each unit. 9. Owner to monitor discharge and space temp. Reduce outdoor air qty should space temp fall below low end temperature value of occupant comfort range ie 67 degrees or ahu discharge temp fall below 45 degrees. Hot Water Boiler Systems: 1. Provide water inhibitors and 20% glycol by volume and testing to ensure proper water treatment levels are maintained. 20% glycol will achieve 10 deg. F burst protection. 2. Check control system and control devices for proper operation. 3. Check pumps and variable-frequency drives (where installed) for proper operation. Page - 20 GARCIA • GALUSKA • DESOUSA Consulting Engineers Inc.

4. For natural gas systems, check gas pressure, gas valve operation, combustion flue gas venting and combustion air systems (including combustion air fans if installed) 5. Verify proper operation of all safety devices. 6. If necessary, vent air from distribution system high points 7. Verify expansion/compression tank pressures to ensure proper operations. 8. Verify operating temperature for 200 deg. F supply temperature. The original design requires 200 deg. F boiler water temperature. Further Recommendations: 1. Install portable HEPA filters in each space where ventilation rate is less than 2.0 or filter MERV Rating is less than MERV-13. Based upon the calculation for typical spaces each occupied space is recommended to have a portable HEPA filter with 400 CFM of recirculation air. We recommend the HEPA filters run 2 hours prior to occupancy and during occupancy. 2. Consider installation of UV-C filters on the supply side of all air handling units. We recommend air handling units run 2 hours prior to occupancy, during occupancy, and 2 hours post occupancy. 3. Increasing humidity in winter to 40% will require a duct mounted humidifier or space type humidifier.

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AIR CHANGE CALCULATIONS:

Note: Gymnasium, Cafeteria and Kitchen areas are removed from the average number above.

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MIXED AIR CALCULATOR FOR AUDITORIUM UNIT

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MARIA L. BALDWIN SCHOOL 85 Oxford Street Cambridge, MA 02138

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MARIA L. BALDWIN SCHOOL 85 Oxford Street Cambridge, MA 02138

TABLE OF CONTENTS

HVAC SYSTEM OVERVIEW ...... 26 SEQUENCES OF OPERATION: ...... 27 AIR CHANGE CALCULATIONS: ...... 29

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HVAC SYSTEM OVERVIEW

HVAC SYSTEM OVERVIEW

Date: Thursday, August 10, 2020 Building Name: Maria L. Baldwin School Location: 85 Oxford Street

AREA/ROOM HVAC SYSTEM TYPE FILTER REQUIRED FLUSHOUT OPERATION Constant Volume 100% OA Unit w/ HW & CHW MERV 13 – 2” Filter Office Fan Coils w/ HW & CHW MERV 5 – 1” Filter 12.9 Days System Type 3

Gymatorium AHU Unit w/ HW & CHW MERV 13 – 2” Filter 12.9 Days System Type 1

Cafeteria Variable Air Volume AHU w/ HW & CHW MERV 13 – 2” Filter 12.9 Days System Type 2

Kitchen Variable Air Volume AHU w/ HW & CHW MERV 13 – 2” Filter 12.9 Days System Type 2 Typical Classroom AHU w/ HW & CHW in unit & Duct Mounted Cluster (2 Classrooms) Coils for Individual Classrooms MERV 13 – 2” Filter 12.9 Days System Type 1

Library Variable Air Volume AHU w/ HW & CHW MERV 13 – 2” Filter 12.9 Days System Type 2

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SEQUENCES OF OPERATION:

System Type 1 Re-circulation style air conditioning unit with heating, cooling, and supply fan (Gymatorium, Classrooms) 1. Unit shall operate in occupied mode 24/7 for Building Flushout. 2. Supply Fan shall start and continue to run at full design speed. 3. Outside Air Damper & Re-circulation Air Damper shall be fixed and ventilation airflow to mix with the re-circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Heating Season: Hot Water Heating Coil in unit shall modulate to maintain discharge air temperature. Classroom AHU’s shall also modulate the duct mounted heating coils to maintain classroom spaces. 6. Cooling Season: Chilled Water Coil shall modulate to maintain discharge air temperature 7. Unit shall run constantly to deliver constant ventilation to the spaces. 8. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 9. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 10. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy.

System Type 2 Variable air volume AHU unit with heating, cooling, and supply fan (Café, Kitchen, Library) 1. Units shall operate in occupied mode 24/7 for building flushout. 2. Outside air damper shall open to its max position allowed by the units’ capacity. 3. The exhaust damper position (where applicable) shall match the outside air damper position. 4. The recirculation damper shall be closed. 5. The supply fan starts and adjusts its speed based on the duct mounted pressure sensor for 100% air flow. VAV dampers shall be forced to 100% open. 6. The exhaust fan (where applicable) shall start & modulate its speed to match the incoming outside air based on fan speed (hz) of the supply fan. a slight offset of 10% or less shall be provided to ensure a positive pressure is maintained within the building. 7. The cooling section shall modulate to dehumidify the incoming air when the supply air temperature is above the discharge air setpoint of 55 degrees. 8. The heating section shall modulate as required to provide heat to the supply air to maintain the supply air temperature setpoint. 9. CO2 control/demand control ventilation in unit shall be disabled (Library unit only). 10. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 11. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 12. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy.

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System Type 3 Constant Volume 100% OA AHU unit with heating, cooling, and supply fan (Offices) 1. Unit shall operate in occupied mode 24/7 for Building Flushout. 2. Supply Fan shall start and continue to run at full design speed. 3. Outside Air Damper shall be fixed open to provide 100% outside air to spaces. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Heating Season: Hot Water Heating Coil in unit shall modulate to maintain discharge air temperature. 6. Cooling Season: Chilled Water Coil shall modulate to maintain discharge air temperature 7. Unit shall run constantly to deliver constant ventilation to the spaces. 8. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 9. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 10. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy. Further Recommendations: 1. Install portable HEPA filters in each space where ventilation rate is less than 2.0 or filter MERV Rating is less than MERV-13. Based upon the calculation for typical spaces each occupied space is recommended to have a portable HEPA filter with 400 CFM of recirculation air. We recommend the HEPA filters run 2 hours prior to occupancy and during occupancy. 2. Consider installation of UV-C filters on the supply side of HVAC units. We recommend the HVAC units run 2 hours prior to occupancy and during occupancy. 3. Increasing humidity in winter to 40% will require a duct mounted humidifier or space type humidifier.

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AIR CHANGE CALCULATIONS:

Note: Kitchen area is removed from the average number above.

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HAGGERTY SCHOOL 110 Cushing Street Cambridge, MA 02138

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HAGGERTY SCHOOL 110 Cushing Street Cambridge, MA 02138

TABLE OF CONTENTS

HVAC SYSTEM OVERVIEW ...... 32 SEQUENCES OF OPERATION: ...... 33 AIR CHANGE CALCULATIONS: ...... 35

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HVAC SYSTEM OVERVIEW

HVAC SYSTEM OVERVIEW

Date: Thursday, August 10, 2020 Building Name: Haggerty School Location: 110 Cushing Street

AREA/ROOM HVAC SYSTEM TYPE FILTER REQUIRED FLUSHOUT OPERATION Constant Volume 100% OA Unit w/ HW & CHW MERV 13 – 2” Filter Office Unit Vents w/ HW & CHW MERV 5 – 1” Filter 12.9 Days System Type 3

Gymatorium Recirculation RTU Unit w/ HW & CHW MERV 13 – 2” Filter 12.9 Days System Type 1

Cafeteria / Kitchen Recirculation RTU Unit w/ HW & CHW MERV 13 – 2” Filter 12.9 Days System Type 1 Community / Multi- Purpose Unit Vents w/ HW & CHW MERV 5 – 1” Filter 12.9 Days System Type 2

Typical Classroom Unit Vents w/ HW & CHW MERV 5 – 1” Filter 12.9 Days System Type 2

Library Recirculation RTU Unit w/ HW & CHW MERV 13 – 2” Filter 12.9 Days System Type 1 Typical Art, Music, Science, Pre-K Recirculation RTU Unit w/ HW & CHW MERV 13 – 2” Filter 12.9 Days System type 1

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SEQUENCES OF OPERATION:

System Type 1: Re-circulation style air conditioning unit with heating, cooling, and supply fan (Gymatorium, Café/Kitchen, Library, Art, Music, Science, Pre-K) 1. Unit shall operate in occupied mode 24/7 for Building Flushout. 2. Supply Fan shall start and continue to run at full design speed. 3. Outside Air Damper & Re-circulation Air Damper shall be fixed and ventilation airflow to mix with the re-circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Heating Season: Hot Water Heating Coil in unit shall modulate to maintain discharge air temperature. 6. Cooling Season: Chilled Water Coil shall modulate to maintain discharge air temperature 7. Unit shall run constantly to deliver constant ventilation to the spaces. 8. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 9. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 10. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy.

System Type 2: Unit Ventilator & Separate Associated Exhaust System (Community/Muti-Purpose, Typical Classrooms) 1. Unit shall operate in occupied mode 24/7 for building flushout. 2. Supply fan shall start or continue to run at full design speed. 3. Face & Bypass dampers (where applicable) shall modulate to max occupied position to allow the proper ventilation airflow to mix with the re-circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly-positive space pressure. 5. Hot Water Heating coil shall modulate as delegated by the unit controller to maintain the discharge air temperature set-point when/if there is a call for heating from the space temperature sensor. 6. Unit shall run constantly to deliver constant ventilation to the space. 7. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 8. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy.

System Type 3: Constant Volume 100% OA AHU unit with heating, cooling, and supply fan (Offices) 1. Unit shall operate in occupied mode 24/7 for Building Flushout. 2. Supply Fan shall start and continue to run at full design speed. 3. Outside Air Damper shall be fixed open to provide 100% outside air to spaces.

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4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Heating Season: Hot Water Heating Coil in unit shall modulate to maintain discharge air temperature. 6. Cooling Season: Chilled Water Coil shall modulate to maintain discharge air temperature 7. Unit shall run constantly to deliver constant ventilation to the spaces. 8. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 9. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 10. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy. Hot Water Boiler & Chiller Systems (Dual Temperature – 2 Pipe Changeover): 1. Insure existing heating/chilled water has water inhibitors, a minimum of 20% glycol by volume. 2. Check control system and control devices for proper operation. 3. Check pumps and variable-frequency drives (where installed) for proper operation. 4. For Boilers with natural gas systems, check gas pressure, gas valve operation, combustion flue gas venting and combustion air systems (including combustion air fans if installed) 5. Verify proper operation of all safety devices. 6. If necessary, vent air from distribution system high points. 7. Verify expansion/compression tank pressures to ensure proper operations. 8. Verify operating temperature of original design. Further Recommendations: 1. Install portable HEPA filters in each space where ventilation rate is less than 2.0 or filter MERV Rating is less than MERV-13. Based upon the calculation for typical spaces each occupied space is recommended to have a portable HEPA filter with 400 CFM of recirculation air. We recommend the HEPA filters run 2 hours prior to occupancy and during occupancy. 2. Consider installation of UV-C filters on the supply side of HVAC units. We recommend the HVAC units run 2 hours prior to occupancy and during occupancy. 3. Increasing humidity in winter to 40% will require a duct mounted humidifier or space type humidifier.

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AIR CHANGE CALCULATIONS:

Note: Cafeteria/Kitchen area is removed from the average number above.

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LONGFELLOW COMMUNITY SCHOOL 359 Broadway Cambridge, MA 02139

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Longfellow Community School 359 Broadway Cambridge, MA 02139

TABLE OF CONTENTS

HVAC SYSTEM OVERVIEW ...... 38 SEQUENCES OF OPERATION: ...... 39 AIR CHANGE CALCULATIONS: ...... 41

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HVAC SYSTEM OVERVIEW

HVAC SYSTEM OVERVIEW

Date: Monday, August 3, 2020 Building Name: Longfellow Community School Location: 359 Broadway

AREA/ROOM HVAC SYSTEM TYPE FILTER REQUIRED FLUSHOUT OPERATION Unit Ventilator w/ hot water heating coil, window Office AC. MERV 5 filter 32.7 Days System Type 1 CAV air handling unit with HW heating, wall MERV 10 prefilter, MERV 13 bag Gymnasium radiators. filter from central AHU 32.7 Days System Type 2

Cafeteria Unit Ventilator w/ hot water heating coil MERV 5 filter 32.7 Days System Type 1

Kitchen Unit Ventilator w/ hot water heating coil MERV 5 filter 32.7 Days System Type 1

Library Unit Ventilator w/ hot water heating coil MERV 5 filter 32.7 Days System Type 1 Unit Ventilator w/ hot water heating coil, window Typical Classroom AC MERV 5 filter 32.7 Days System Type 1

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SEQUENCES OF OPERATION:

System Type 1: Unit Ventilator & Separate Associated Exhaust System (Offices, Library, Cafeteria, Typical Classrooms) 1. Unit shall operate in occupied mode 24/7 for building flushout. 2. Face & Bypass dampers (where applicable) shall modulate to max occupied position to allow the proper ventilation airflow to mix with the re-circulated room air. 3. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly-positive space pressure. 4. Hot Water Heating coil shall modulate as delegated by the unit controller to maintain the discharge air temperature set-point when/if there is a call for heating from the space temperature sensor. 5. Unit shall run constantly to deliver constant ventilation to the space. 6. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 7. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy.

System Type 2: Re-circulation style air-handling unit with heating, supply fan, and associated exhaust fan system (Gymnasium) 1. Unit shall operate in occupied mode 24/7 for building flushout. 2. Supply fan shall start and continue to run at full design speed. 3. Outside Air Damper & Re-circulation Air Damper are fixed and ventilation airflow to mix with the re- circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Heating coil shall modulate to maintain discharge air temperature. 6. Unit shall run continuously to deliver constant ventilation to the spaces. 7. Unit Freeze-stat, damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 8. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 9. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy 10. Air handling units need to match space air exchange calculator. 30% outside air shall be verified for each unit. Hot Water Boiler Systems: 1. Provide water inhibitors and 20% glycol by volume and testing to ensure proper water treatment levels are maintained. 20% glycol will achieve 10 deg. F burst protection. 2. Check control system and control devices for proper operation. 3. Check pumps and variable-frequency drives (where installed) for proper operation. 4. For natural gas systems, check gas pressure, gas valve operation, combustion flue gas venting and combustion air systems (including combustion air fans if installed) 5. Verify proper operation of all safety devices.

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6. If necessary, vent air from distribution system high points 7. Verify expansion/compression tank pressures to ensure proper operations. 8. Verify operating temperature for 200 deg. F supply temperature. The original design requires 200 deg. F boiler water temperature with a 20°F temperature drop. Further Recommendations: 1. Install portable HEPA filters in each space where ventilation rate is less than 2.0. Based upon the calculation for typical spaces each occupied space is recommended to have a portable HEPA filter with 400 CFM of recirculation air. We recommend the HEPA filters run 2 hours prior to occupancy and during occupancy. 2. Consider installation of UV-C filters on the supply side of all air handling units. We recommend air handling units run 2 hours prior to occupancy, during occupancy, and 2 hours post occupancy. 3. Increasing humidity in winter to 40% will require a duct mounted humidifier or space type humidifier.

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AIR CHANGE CALCULATIONS:

Note: Kitchen and Auditorium areas are removed from the average number above.

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FLETCHER MAYNARD ACADEMY SCHOOL 225 Windsor St. Cambridge, MA 02139

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Fletcher Maynard Academy School 225 Windsor St. Cambridge, MA 02139

TABLE OF CONTENTS

HVAC SYSTEM OVERVIEW ...... 44 SEQUENCES OF OPERATION: ...... 45 AIR CHANGE CALCULATIONS: ...... 47

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HVAC SYSTEM OVERVIEW

HVAC SYSTEM OVERVIEW

Date: Monday, August 3, 2020 Building Name: Fletcher Maynard School Location: 225 Windsor Street

AREA/ROOM HVAC SYSTEM TYPE FILTER REQUIRED FLUSHOUT OPERATION Unit Ventilator w/ hot water heating coil, window Office AC. MERV 5 filter 23.5 Days System Type 1 CAV air handling unit with HW heating, wall MERV 10 prefilter, MERV 13 bag Gymnasium radiators. filter from central AHU 23.5 Days System Type 2 MERV 10 prefilter, MERV 13 bag Cafeteria CAV air handling unit with HW heating. filter from central AHU 23.5 Days System Type 2

Kitchen Unit Ventilator w/ hot water heating coil MERV 5 filter 23.5 Days System Type 1

Library Unit Ventilator w/ hot water heating coil MERV 5 filter 23.5 Days System Type 1 Unit Ventilator w/ hot water heating coil, window Typical Classroom AC MERV 5 filter 23.5 Days System Type 1

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SEQUENCES OF OPERATION:

System Type 1: Unit Ventilator & Separate Associated Exhaust System (Offices, Library, Typical Classrooms) 1. Unit shall operate in occupied mode 24/7 for building flushout. 2. Supply fan shall start or continue to run at full design speed. 3. Face & Bypass dampers (where applicable) shall modulate to max occupied position to allow the proper ventilation airflow to mix with the re-circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly-positive space pressure. 5. Hot Water Heating coil shall modulate as delegated by the unit controller to maintain the discharge air temperature set-point when/if there is a call for heating from the space temperature sensor. 6. Unit shall run constantly to deliver constant ventilation to the space. 7. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 8. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy.

System Type 2: Re-circulation style air-handling unit with heating, supply fan, and associated exhaust fan system 1. Unit shall operate in occupied mode 24/7 for building flushout. 2. Supply fan shall start and continue to run at full design speed. 3. Outside Air Damper & Re-circulation Air Damper are fixed and ventilation airflow to mix with the re- circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Heating coil shall modulate to maintain discharge air temperature. 6. Unit shall run continuously to deliver constant ventilation to the spaces. 7. Unit Freeze-stat, damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 8. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 9. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy 10. Air handling units need to match space air exchange calculator. 30% outside air shall be verified for each unit. Hot Water Boiler Systems: 1. Provide water inhibitors and 20% glycol by volume and testing to ensure proper water treatment levels are maintained. 20% glycol will achieve 10 deg. F burst protection. 2. Check control system and control devices for proper operation. 3. Check pumps and variable-frequency drives (where installed) for proper operation. 4. For natural gas systems, check gas pressure, gas valve operation, combustion flue gas venting and combustion air systems (including combustion air fans if installed) Page - 45 GARCIA • GALUSKA • DESOUSA Consulting Engineers Inc.

5. Verify proper operation of all safety devices. 6. If necessary, vent air from distribution system high points 7. Verify expansion/compression tank pressures to ensure proper operations. 8. Verify operating temperature for 200 deg. F supply temperature. The original design requires 200 deg. F boiler water temperature with a 20°F temperature drop. Further Recommendations: 1. Install portable HEPA filters in each space where ventilation rate is less than 2.0. Based upon the calculation for typical spaces each occupied space is recommended to have a portable HEPA filter with 400 CFM of recirculation air. We recommend the HEPA filters run 2 hours prior to occupancy and during occupancy. 2. Consider installation of UV-C filters on the supply side of all air handling units. We recommend air handling units run 2 hours prior to occupancy, during occupancy, and 2 hours post occupancy. 3. Increasing humidity in winter to 40% will require a duct mounted humidifier or space type humidifier.

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AIR CHANGE CALCULATIONS:

Note: Auditorium area is removed from the average number above.

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DR. MARTIN LUTHER KING, JR. SCHOOL 102 Putnam Ave Cambridge, MA 02139

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DR. MARTIN LUTHER KING, JR. SCHOOL 102 Putnam Ave Cambridge, MA 02139

TABLE OF CONTENTS

HVAC SYSTEM OVERVIEW ...... 50 SEQUENCES OF OPERATION: ...... 51 AIR CHANGE CALCULATIONS: ...... 53

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HVAC SYSTEM OVERVIEW

HVAC SYSTEM OVERVIEW

Date: Thursday, August 10, 2020 Building Name: Dr. Martin Luther King, Jr. School Location: 102 Putnam Ave.

AREA/ROOM HVAC SYSTEM TYPE FILTER REQUIRED FLUSHOUT OPERATION Energy Recovery Ventilator RTU Unit w/Heat MERV 7 – 2” Filter Pre-School Pump MERV 13 – 4” Filter 16.7 Days System Type 1 Energy Recovery Ventilator RTU Unit w/Heat MERV 7 – 2” Filter Gymnasium (Typical) Pump MERV 13 – 4” Filter 16.7 Days System Type 1 Energy Recovery Ventilator RTU Unit w/Heat MERV 7 – 2” Filter Community Pump MERV 13 – 4” Filter 16.7 Days System Type 1 Reading / Performing Energy Recovery Ventilator RTU Unit w/Heat MERV 7 – 2” Filter Arts Pump MERV 13 – 4” Filter 16.7 Days System Type 1

Typical Classroom Water Source Heat Pump MERV 13 – 2” Filter 16.7 Days System Type 2 Upper School/ Lower Dedicated Outdoor Air System (DOAS) with MERV 8 – 2” Filter School / Café’ Heat Pump MERV 13 – 4” Filter 16.7 Days System Type 3 Dedicated Outdoor Air System (AHU-1) with MERV 8 – 2” Filter Auditorium Heat Pump MERV 13 – 4” Filter 16.7 Days System Type 3

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SEQUENCES OF OPERATION:

System Type 1: 100% Dedicated Outdoor Air System (DOAS) ground source heat hump, supply and exhaust fans 1. Unit shall operate in occupied mode 24/7 for Building Flushout. 2. Supply and Exhaust Fans shall start and continue to run at full design speed. 3. Aircuity system shall be disengaged. 4. Outside Air Damper shall be full open, Re-circulation Air Damper shall be full closed. 5. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 6. Heating Season: Heat Pump in the unit shall modulate to maintain discharge air temperature. 7. Cooling Season: Heat pump in the unit shall modulate to maintain discharge air temperature. 8. Unit shall run constantly to deliver constant ventilation to the spaces. 9. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 10. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 11. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy.

System Type 2: Ground Source Heat Pump System (Typical Classrooms) 1. Unit shall operate in occupied mode 24/7 for building flushout. 2. Supply fan shall start or continue to run at full design speed. 3. Face & Bypass dampers (where applicable) shall modulate to max occupied position to allow the proper ventilation airflow to mix with the re-circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly-positive space pressure. 5. Unit shall run constantly to deliver constant ventilation to the space. 6. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 7. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy.

System Type 3: 100% OA Energy Recovery Ventilator (ERV) unit with ground source heat hump, supply and exhaust fans 1. Unit shall operate in occupied mode 24/7 for Building Flushout. 2. Supply Fan shall start and continue to run at full design speed. 3. Aircuity system shall be disengaged. 4. Outside Air Damper shall be fixed open to provide 100% outside air to spaces. 5. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 6. Heating Season: Heat pump in unit shall modulate to maintain discharge air temperature. Page - 51 GARCIA • GALUSKA • DESOUSA Consulting Engineers Inc.

7. Cooling Season: Heat pump in unit shall modulate to maintain discharge air temperature 8. Unit shall run constantly to deliver constant ventilation to the spaces. 9. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 10. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 11. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy.

Geothermal System: 1. Ensure existing geothermal system has water inhibitors, and 20% glycol by volume. 2. Check control system and control devices for proper operation. 3. Check pumps and variable-frequency drives (where installed) for proper operation. 4. For Boilers with natural gas systems, check gas pressure, gas valve operation, combustion flue gas venting and combustion air systems (including combustion air fans if installed) 5. Verify proper operation of all safety devices. 6. If necessary, vent air from distribution system high points. 7. Verify expansion/compression tank pressures to ensure proper operations. 8. Verify operating temperature of original design.

Further Recommendations: 1. Install portable HEPA filters in each space where ventilation rate is less than 2.0 or filter MERV Rating is less than MERV-13. Based upon the calculation for typical spaces each occupied space is recommended to have a portable HEPA filter with 400 CFM of recirculation air. We recommend the HEPA filters run 2 hours prior to occupancy and during occupancy. 2. Consider installation of UV-C filters on the supply side of HVAC units. We recommend the HVAC units run 2 hours prior to occupancy and during occupancy. 3. Increasing humidity in winter to 40% will require a duct mounted humidifier or space type humidifier.

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AIR CHANGE CALCULATIONS:

Note: Fitness, Performing Arts, Café/Serv and Auditorium areas are removed from the average number above.

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KING OPEN & CAMBRIDGE STREET UPPER SCHOOLS 850 Cambridge Street Cambridge, MA 021141

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King Open & Cambridge Street Upper Schools 850 Cambridge Street Cambridge, MA 021141

TABLE OF CONTENTS

HVAC SYSTEM OVERVIEW ...... 56 SEQUENCES OF OPERATION: ...... 58 AIR CHANGE CALCULATIONS: ...... 60

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HVAC SYSTEM OVERVIEW HVAC SYSTEM OVERVIEW

Date: Thursday, August 13, 2020 King Open & Cambridge Street Upper Building Name: Schools Location: 850 Cambridge Street

AREA/ROOM HVAC SYSTEM TYPE FILTER REQUIRED FLUSHOUT OPERATION Constant Volume 100% OA RTU w/ HW & CHW MERV 13 – 12” Filter Office Areas Induction Units w/ HW & CHW MERV 8 – 2” Filter 12.9 Days System Type 3 MERV 13 – 12” Filter Auditorium/Stage Variable Air Volume RTU w/ HW & CHW MERV 8 – 2” Filter 12.9 Days System Type 1 MERV 13 – 12” Filter Gymnasium Variable Air Volume RTU w/ HW & CHW MERV 8 – 2” Filter 12.9 Days System Type 1 MERV 13 – 12” Filter Fitness Room Variable Air Volume RTU w/ HW & CHW MERV 8 – 2” Filter 12.9 Days System Type 1 MERV 13 – 12” Filter Cafeteria Variable Air Volume RTU w/ HW & CHW MERV 8 – 2” Filter 12.9 Days System Type 1 Variable Air Volume 100% OA RTU w/ HW & MERV 13 – 12” Filter Kitchen CHW MERV 8 – 2” Filter 12.9 Days System Type 2 Classrooms and Variable Air Volume 100% OA RTU w/ HW & MERV 13 – 12” Filter Support Areas CHW MERV 8 – 2” Filter 12.9 Days System Type 2 Pool Area & Locker Variable Air Volume 100% OA RTU w/ HW & MERV 13 – 12” Filter Rooms CHW MERV 8 – 2” Filter 12.9 Days System Type 2

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Constant Volume 100% OA RTU w/ HW & CHW MERV 13 – 12” Filter Library Induction Units w/ HW & CHW MERV 8 – 2” Filter 12.9 Days System Type 3

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SEQUENCES OF OPERATION:

System Type 1 Variable air volume re-circulation style air conditioning unit with heating, cooling, supply fan, and exhaust fan (Auditorium/Stage, Cafeteria, Gymnasium, Fitness Room) 1. Units shall operate in occupied mode 24/7 for building flushout. 2. Outside air damper shall open to its max position allowed by the units’ capacity. 3. The exhaust damper position shall match the outside air damper position. 4. The recirculation damper shall be open in response to the opposing signal from the outside air damper. 5. The supply fan starts and adjusts its speed based on the duct mounted pressure sensor for 100% air flow. VAV dampers shall be forced to 100% open. (Fitness Areas only) 6. The exhaust fan (where applicable) shall start & modulate its speed to match the incoming outside air based on fan speed (hz) of the supply fan. a slight offset of 10% or less shall be provided to ensure a positive pressure is maintained within the building. 7. The cooling section shall modulate to dehumidify the incoming air when the supply air temperature is above the discharge air setpoint of 63 degrees. 8. The heating section shall modulate as required to provide heat to the supply air to maintain the supply air temperature setpoint. 9. CO2 control/demand control ventilation in unit and terminal VAV units (where applicable) shall be disabled. 10. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 11. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 12. System shall run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy.

System Type 2 Variable air volume 100% OA RTU unit with heating, cooling, supply fan, and exhaust fan (Classroom and Support Areas, Pool/Locker Area) 1. Units shall operate in occupied mode 24/7 for building flushout. 2. Outside air damper shall open to its max position to provide 100% outside air to spaces. 3. The exhaust damper position shall match the outside air damper position of 100% open. 4. The recirculation damper shall be closed. 5. The supply fan starts and adjusts its speed based on the duct mounted pressure sensor for 100% air flow. VAV dampers shall be forced to 100% open. 6. The exhaust fan shall start & modulate its speed to match the incoming outside air based on fan speed (hz) of the supply fan. a slight offset of 10% or less shall be provided to ensure a positive pressure is maintained within the building. 7. The cooling section shall modulate to dehumidify the incoming air when the supply air temperature is above the discharge air setpoint of 63 degrees. 8. The heating section shall modulate as required to provide heat to the supply air to maintain the supply air temperature setpoint. 9. CO2 control/demand control ventilation in unit and terminal VAV units shall be disabled. 10. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm.

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11. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 12. System shall run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy.

System Type 3 Constant Volume 100% OA RTU unit with heating, cooling, supply fan, and exhaust fan (Office and Library Areas) 1. Units shall operate in occupied mode 24/7 for Building Flushout. 2. Supply Fan shall start and continue to run at full design speed. 3. Outside Air Damper shall be fixed open to provide 100% outside air to spaces. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Heating Season: Hot Water Heating Coil in unit shall modulate to maintain discharge air temperature. 6. Cooling Season: Chilled Water Coil shall modulate to maintain discharge air temperature 7. Unit shall run constantly to deliver constant ventilation to the spaces. 8. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 9. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 10. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy. Further Recommendations: 1. Air handling units need to match space air exchange calculator. Increase RTU-8 to 8,000 CFM O.A., RTU-9 to 5,600 CFM O.A., RTU-13 to 6,000 CFM O.A., and RTU-14 to 6,800 CFM O.A. and verify each unit can maintain space required temperature and humidity setpoints at increased outside air volumes. Owner to monitor discharge and space temp. Reduce outdoor air volume should space temp fall below low end temperature value of occupant comfort range i.e. 67 degrees or AHU discharge temp fall below 63 degrees. 2. Install portable HEPA filters in each space where ventilation rate is less than 2.0 or filter MERV Rating is less than MERV-13. Based upon the calculation for typical spaces each occupied space is recommended to have a portable HEPA filter with 400 CFM of recirculation air. We recommend the HEPA filters run 2 hours prior to occupancy and during occupancy. 3. Consider installation of UV-C filters on the supply side of HVAC units. We recommend the HVAC units run 2 hours prior to occupancy and during occupancy. 4. Increasing humidity in winter to 40% will require a duct mounted humidifier or space type humidifier.

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AIR CHANGE CALCULATIONS:

Note: Auditorium/Stage, Fitness Room, Cafeteria/Lobby and Kitchen areas are removed from the average number above.

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CAMBRIDGE, RIDGE & LATIN SCHOOL 459 Broadway Street Cambridge, MA 021141

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Cambridge, Ridge & Latin School 459 Broadway Street Cambridge, MA 021141

TABLE OF CONTENTS

HVAC SYSTEM OVERVIEW ...... 63 SEQUENCES OF OPERATION: ...... 64 AIR CHANGE CALCULATIONS: ...... 66

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HVAC SYSTEM OVERVIEW HVAC SYSTEM OVERVIEW

Date: Thursday, August 13, 2020 Building Name: Cambridge, Ridge & Latin School Location: 459 Broadway Street

AREA/ROOM HVAC SYSTEM TYPE FILTER REQUIRED FLUSHOUT OPERATION Office Areas / Constant Volume 100% OA RTU w/ HW & CHW MERV 14 – 12” Filter Guidance Induction Units w/ HW & CHW MERV 8 – 2” Filter 15.0 Days System Type 3 MERV 14 – 12” Filter Auditorium/Stage Variable Air Volume RTU w/ HW & CHW MERV 8 – 2” Filter 15.0 Days System Type 1 MERV 14 – 12” Filter Cafeteria Variable Air Volume RTU w/ HW & CHW MERV 8 – 2” Filter 15.0 Days System Type 1 Variable Air Volume 100% OA RTU w/ HW & MERV 14 – 12” Filter Kitchen CHW MERV 8 – 2” Filter 15.0 Days System Type 2 Constant Volume 100% OA RTU w/ HW & CHW MERV 14 – 12” Filter Library Induction Units w/ HW & CHW MERV 8 – 2” Filter 15.0 Days System Type 3 Classrooms and Variable Air Volume 100% OA RTU w/ HW & MERV 14 – 12” Filter Support Areas CHW MERV 8 – 2” Filter 15.0 Days System Type 2 Constant Volume 100% OA RTU w/ HW & CHW MERV 14 – 12” Filter Carpentry Induction Units w/ HW & CHW MERV 8 – 2” Filter 15.0 Days System Type 3

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SEQUENCES OF OPERATION:

System Type 1 Variable air volume re-circulation style air conditioning unit with heating, cooling, supply fan, and exhaust fan (Auditorium/Stage, Cafeteria) 1. Units shall operate in occupied mode 24/7 for building flushout. 2. Outside air damper shall open to its max position allowed by the units’ capacity. 3. The exhaust damper position shall match the outside air damper position. 4. The recirculation damper shall be open in response to the opposing signal from the outside air damper. 5. The supply fan starts and adjusts its speed based on the duct mounted pressure sensor for 100% air flow. VAV dampers shall be forced to 100% open. (Fitness Areas only) 6. The exhaust fan (where applicable) shall start & modulate its speed to match the incoming outside air based on fan speed (hz) of the supply fan. a slight offset of 10% or less shall be provided to ensure a positive pressure is maintained within the building. 7. The cooling section shall modulate to dehumidify the incoming air when the supply air temperature is above the discharge air setpoint of 63 degrees. 8. The heating section shall modulate as required to provide heat to the supply air to maintain the supply air temperature setpoint. 9. CO2 control/demand control ventilation in unit and terminal VAV units (where applicable) shall be disabled. 10. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 11. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 12. System shall run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy.

System Type 2 Variable air volume 100% OA RTU unit with heating, cooling, supply fan, and exhaust fan (Classroom and Support Areas, Library) 1. Units shall operate in occupied mode 24/7 for building flushout. 2. Outside air damper shall open to its max position to provide 100% outside air to spaces. 3. The exhaust damper position shall match the outside air damper position of 100% open. 4. The recirculation damper shall be closed. 5. The supply fan starts and adjusts its speed based on the duct mounted pressure sensor for 100% air flow. VAV dampers shall be forced to 100% open. 6. The exhaust fan shall start & modulate its speed to match the incoming outside air based on fan speed (hz) of the supply fan. a slight offset of 10% or less shall be provided to ensure a positive pressure is maintained within the building. 7. The cooling section shall modulate to dehumidify the incoming air when the supply air temperature is above the discharge air setpoint of 63 degrees. 8. The heating section shall modulate as required to provide heat to the supply air to maintain the supply air temperature setpoint. 9. CO2 control/demand control ventilation in unit and terminal VAV units shall be disabled. 10. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm.

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11. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 12. System shall run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy. Further Recommendations: 1. Install portable HEPA filters in each space where ventilation rate is less than 2.0. Based upon the calculation for typical spaces each occupied space is recommended to have a portable HEPA filter with 400 CFM of recirculation air. We recommend the HEPA filters run 2 hours prior to occupancy and during occupancy. 2. Consider installation of UV-C filters on the supply side of HVAC units. We recommend the HVAC units run 2 hours prior to occupancy and during occupancy. 3. Increasing humidity in winter to 40% will require a duct mounted humidifier or space type humidifier.

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AIR CHANGE CALCULATIONS:

Note: Kitchen, Kilns, Dart Rooms, Stage, Carpentry and Auditorium areas are removed from the average number above.

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WAR MEMORIAL RECREATION CENTER 1640 Cambridge St. Cambridge, MA 02139

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War Memorial Recreation Center 1640 Cambridge St. Cambridge, MA 02139

TABLE OF CONTENTS

HVAC SYSTEM OVERVIEW ...... 69 SEQUENCES OF OPERATION: ...... 70 AIR CHANGE CALCULATIONS: ...... 72

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HVAC SYSTEM OVERVIEW

HVAC SYSTEM OVERVIEW

Date: Friday, August 14, 2020 Building Name: War Memorial Recreation Center Location: 1640 Cambridge Street

AREA/ROOM HVAC SYSTEM TYPE FILTER REQUIRED FLUSHOUT OPERATION Rooftop unit with energy recovery wheel, HW MERV 8 prefilter, MERV 13 final Field House heating and CW cooling filter from central AHU 12.7 Days System Type 3 Single zone air handling unit with HW heating MERV 8 prefilter, MERV 13 final Gymnasium and CW cooling filter 12.7 Days System Type 2 Air handling unit with energy recovery wheel, MERV 8 prefilter, MERV 13 final Lockers HW heating and CW cooling filter 12.7 Days System Type 1 Air handling unit with HW heating and CW MERV 8 prefilter, MERV 13 final Weights/Fitness cooling filter 12.7 Days System Type 1 Athletic offices/ Air handling unit with HW heating and CW MERV 8 prefilter, MERV 13 final Classes cooling filter 12.7 Days System Type 1 Air handling unit with HW heating and CW MERV 8 prefilter, MERV 13 final Toilets and Corridors cooling filter 12.7 Days System Type 1

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SEQUENCES OF OPERATION:

System Type 1: Re-circulation style air-handling unit with heating, cooling, supply fan, and associated return fan system 1. Unit shall operate in occupied mode 24/7 for building flushout. 2. Supply fan shall start and continue to run at full design speed. 3. Outside Air Damper & Re-circulation Air Damper are fixed and ventilation airflow to mix with the re- circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Heating or cooling coil shall modulate to maintain discharge air temperature. 6. Unit shall run continuously to deliver constant ventilation to the spaces. 7. Unit Freeze-stat, damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 8. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 9. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy

System Type 2: Re-circulation style air-handling unit with heating, cooling, supply fan, and associated return fan system 1. Unit shall operate in occupied mode 24/7 for building flushout. 2. Supply fan shall start and continue to run at full design speed. 3. Outside Air Damper shall be full open & Re-circulation Air Damper closed. Energy recovery wheel shall run. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Heating or cooling coil shall modulate to maintain discharge air temperature. 6. Unit shall run continuously to deliver constant ventilation to the spaces. 7. Unit Freeze-stat, damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 8. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 9. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy

System Type 3: Re-circulation style rooftop unit with energy recovery wheel, heating, cooling, supply fan, and associated return fan system 1. Unit shall operate in occupied mode 24/7 for building flushout. 2. Supply fan shall start and continue to run at full design speed. 3. Outside Air Damper shall be full open & Re-circulation Air Damper shall be closed. Heat wheel shall run.

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4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Heating or cooling coil shall modulate to maintain discharge air temperature. 6. Unit shall run continuously to deliver constant ventilation to the spaces. 7. Unit Freeze-stat, damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 8. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 9. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy

Hot Water Boiler Systems: 1. Provide water inhibitors and 20% glycol by volume and testing to ensure proper water treatment levels are maintained. 20% glycol will achieve 10 deg. F burst protection. 2. Check control system and control devices for proper operation. 3. Check pumps and variable-frequency drives (where installed) for proper operation. 4. For natural gas systems, check gas pressure, gas valve operation, combustion flue gas venting and combustion air systems (including combustion air fans if installed) 5. Verify proper operation of all safety devices. 6. If necessary, vent air from distribution system high points 7. Verify expansion/compression tank pressures to ensure proper operations. 8. Verify operating temperature for 200 deg. F supply temperature. The original design requires 200 deg. F boiler water temperature. Further Recommendations: 1. Install portable HEPA filters in each space where ventilation rate is less than 2.0. Based upon the calculation for typical spaces each occupied space is recommended to have a portable HEPA filter with 400 CFM of recirculation air. We recommend the HEPA filters run 2 hours prior to occupancy and during occupancy. 2. Consider installation of UV-C filters on the supply side of all air handling units. We recommend air handling units run 2 hours prior to occupancy, during occupancy, and 2 hours post occupancy. 3. Increasing humidity in winter to 40% will require a duct mounted humidifier or space type humidifier.

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AIR CHANGE CALCULATIONS:

Note: Pool area is removed from the average number above.

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MORSE SCHOOL 40 Granite Street Cambridge, MA 02138

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MORSE SCHOOL 40 Granite Street Cambridge, MA 02138

TABLE OF CONTENTS

HVAC SYSTEM OVERVIEW ...... 87 SEQUENCES OF OPERATION: ...... 88 AIR CHANGE CALCULATIONS: ...... 90

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HVAC SYSTEM OVERVIEW

HVAC SYSTEM OVERVIEW

Date: Thursday, August 10, 2020 Building Name: Morse School Location: 40 Granite Street

AREA/ROOM HVAC SYSTEM TYPE FILTER REQUIRED FLUSHOUT OPERATION Above Ceiling Unit Vent w/ HW & CHW (2 Pipe Admin Offices Change Over) MERV 5 – 1” Filter 16.9 Days System Type 2 Unit Vents w/ HW & CHW (2 Pipe Change Typical Classroom Over) MERV 5 – 1” Filter 16.9 Days System Type 2

Kitchen Recirculation RTU Unit w/ Heating Only MERV 13 – 2” Filter 16.9 Days System Type 3

Gymnasium Recirculation RTU Unit w/ Heating Only MERV 13 – 2” Filter 16.9 Days System Type 3

Cafeteria Recirculation RTU Unit w/ HW & CHW MERV 13 – 2” Filter 16.9 Days System Type 1

Library Recirculation RTU Unit w/ HW & CHW MERV 13 – 2” Filter 16.9 Days System Type 1

Auditorium Recirculation RTU Unit w/ HW & CHW MERV 13 – 2” Filter 16.9 Days System type 1

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SEQUENCES OF OPERATION:

System Type 1: Re-circulation style air conditioning unit with heating, cooling, and supply fan (Auditorium, Café, Library) 1. Unit shall operate in occupied mode 24/7 for Building flush out. 2. Units are capable or recirc but shall operate to provide 100% outside air. 3. Supply Fan shall start and continue to run at full design speed. 4. Outside Air Damper shall be full open & Re-circulation Air Damper closed. 5. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 6. Heating Season: Ductwork Hot Water Heating Coil shall modulate to maintain discharge air temperature. 7. Cooling Season: Ductwork Chilled Water Coil shall modulate to maintain discharge air temperature 8. Unit shall run constantly to deliver constant ventilation to the spaces. 9. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 10. Inspect condition of existing filters. Install new filters if needed prior to flush out and change filters after to flush out. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 11. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy.

System Type 2: Unit Ventilator & Separate Associated Exhaust System (Community/Muti-Purpose, Typical Classrooms) 1. Unit shall operate in occupied mode 24/7 for building flush out. 2. Supply fan shall start or continue to run at full design speed. 3. Face & Bypass dampers (where applicable) shall modulate to max occupied position to allow the proper ventilation airflow to mix with the re-circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly-positive space pressure. 5. Hot Water Heating coil shall modulate as delegated by the unit controller to maintain the discharge air temperature set-point when/if there is a call for heating from the space temperature sensor. 6. Unit shall run constantly to deliver constant ventilation to the space. 7. Inspect condition of existing filters. Install new filters if needed prior to flush out and change filters after to flush out. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 8. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy.

System Type 3: Recirc style RTU (H&V) unit with heating only and supply fan (Gym, Kitchen) 1. Unit shall operate in occupied mode 24/7 for Building flush out. 2. Units are capable or recirc but shall operate to provide 100% outside air. 3. Supply Fan shall start and continue to run at full design speed. 4. Outside Air Damper shall be fixed open to provide 100% outside air to spaces.

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5. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 6. Heating Season: Ductwork Hot Water Heating Coil shall modulate to maintain discharge air temperature. 7. Unit shall run constantly to deliver constant ventilation to the spaces. 8. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 9. Inspect condition of existing filters. Install new filters if needed prior to flush out and change filters after to flush out. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 10. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy. Hot Water Boiler & Chiller Systems (Dual Temperature – 2 Pipe Changeover): 1. Insure existing heating/chilled water has water inhibitors, a minimum of 20% glycol by volume. 2. Check control system and control devices for proper operation. 3. Check pumps and variable-frequency drives (where installed) for proper operation. 4. For Boilers with natural gas systems, check gas pressure, gas valve operation, combustion flue gas venting and combustion air systems (including combustion air fans if installed) 5. Verify proper operation of all safety devices. 6. If necessary, vent air from distribution system high points. 7. Verify expansion/compression tank pressures to ensure proper operations. 8. Verify operating temperature of original design. Further Recommendations: 1. Install portable HEPA filters in each space where ventilation rate is less than 2.0 or filter MERV Rating is less than MERV-13. Based upon the calculation for typical spaces each occupied space is recommended to have a portable HEPA filter with 400 CFM of recirculation air. We recommend the HEPA filters run 2 hours prior to occupancy and during occupancy. 2. Consider installation of UV-C filters on the supply side of HVAC units. We recommend the HVAC units run 2 hours prior to occupancy and during occupancy. 3. Increasing humidity in winter to 40% will require a duct mounted humidifier or space type humidifier.

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AIR CHANGE CALCULATIONS:

Note: Library, Gymnasium, Cafeteria and Kitchen areas are removed from the average number above.

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PEABODY SCHOOL 70 Rindge Avenue Cambridge, MA 02140

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PEABODY SCHOOL 70 Rindge Avenue Cambridge, MA 02140

TABLE OF CONTENTS

HVAC SYSTEM OVERVIEW ...... 81 SEQUENCES OF OPERATION: ...... 82 AIR CHANGE CALCULATIONS: ...... 84

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HVAC SYSTEM OVERVIEW

HVAC SYSTEM OVERVIEW

Date: Thursday, August 10, 2020 Building Name: Peabody School Location: 70 Rindge Avenue

AREA/ROOM HVAC SYSTEM TYPE FILTER REQUIRED FLUSHOUT OPERATION Recirculation RTU Unit w/ HW & CHW & Duct Admin/Art/Media Reheat Coils MERV 13 – 2” Filter 15.4 Days System Type 1

Gym Recirculation RTU Unit w/ HW & CHW MERV 13 – 2” Filter 15.4 Days System Type 1 Recirculation RTU Unit w/ HW & CHW & Duct Cafeteria Reheat Coils MERV 13 – 2” Filter 15.4 Days System Type 1

Community Center Recirculation RTU Unit w/ HW & CHW MERV 13 – 2” Filter 15.4 Days System Type 1

Typical Classroom Unit Vents w/ HW & CHW MERV 5 – 1” Filter 15.4 Days System Type 2

Kitchen Recirculation RTU Unit w/ HW & CHW MERV 13 – 2” Filter 15.4 Days System Type 1 Recirculation RTU Unit w/ HW & CHW & Duct Play/Multi/Pre-K Reheat Coils MERV 13 – 2” Filter 15.4 Days System Type 1

Auditorium Recirculation RTU Unit w/ HW & CHW MERV 13 – 2” Filter 15.4 Days System Type 1

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SEQUENCES OF OPERATION:

System Type 1: Re-circulation style air conditioning unit with heating, cooling, and supply fan 1. Unit shall operate in occupied mode 24/7 for Building Flushout. 2. Supply Fan shall start and continue to run at full design speed. 3. Outside Air Damper & Re-circulation Air Damper shall be fixed and ventilation airflow to mix with the re-circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Heating Season: Hot Water Heating Coil in unit shall modulate to maintain discharge air temperature. 6. Cooling Season: Chilled Water Coil shall modulate to maintain discharge air temperature 7. Unit shall run constantly to deliver constant ventilation to the spaces. 8. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 9. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 10. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy.

System Type 2: Unit Ventilator & Separate Associated Exhaust System 1. Unit shall operate in occupied mode 24/7 for building flushout. 2. Supply fan shall start or continue to run at full design speed. 3. Face & Bypass dampers (where applicable) shall modulate to max occupied position to allow the proper ventilation airflow to mix with the re-circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly-positive space pressure. 5. Hot Water Heating coil shall modulate as delegated by the unit controller to maintain the discharge air temperature set-point when/if there is a call for heating from the space temperature sensor. 6. Unit shall run constantly to deliver constant ventilation to the space. 7. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 8. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy. Hot Water Boiler & Chiller Systems (Dual Temperature – 2 Pipe Changeover): 1. Insure existing heating/chilled water has water inhibitors, a minimum of 20% glycol by volume. 2. Check control system and control devices for proper operation. 3. Check pumps and variable-frequency drives (where installed) for proper operation. 4. For Boilers with natural gas systems, check gas pressure, gas valve operation, combustion flue gas venting and combustion air systems (including combustion air fans if installed) 5. Verify proper operation of all safety devices. Page - 82 GARCIA • GALUSKA • DESOUSA Consulting Engineers Inc.

6. If necessary, vent air from distribution system high points. 7. Verify expansion/compression tank pressures to ensure proper operations. 8. Verify operating temperature of original design. Further Recommendations: 1. Install portable HEPA filters in each space where ventilation rate is less than 2.0 or filter MERV Rating is less than MERV-13. Based upon the calculation for typical spaces each occupied space is recommended to have a portable HEPA filter with 400 CFM of recirculation air. We recommend the HEPA filters run 2 hours prior to occupancy and during occupancy. 2. Consider installation of UV-C filters on the supply side of HVAC units. We recommend the HVAC units run 2 hours prior to occupancy and during occupancy. 3. Increasing humidity in winter to 40% will require a duct mounted humidifier or space type humidifier.

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AIR CHANGE CALCULATIONS:

Note: Kitchen area is removed from the average number above.

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GRAHAM & PARKS SCHOOL 44 Linnaean Street Cambridge, MA 02138

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GRAHAM & PARKS SCHOOL 44 Linnaean Street Cambridge, MA 02138

TABLE OF CONTENTS

HVAC SYSTEM OVERVIEW ...... 87 SEQUENCES OF OPERATION: ...... 88 AIR CHANGE CALCULATIONS: ...... 90

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HVAC SYSTEM OVERVIEW

HVAC SYSTEM OVERVIEW

Date: Thursday, August 5, 2020 Building Name: Graham and Parks School Location: 44 Linnaean Street

AREA/ROOM HVAC SYSTEM TYPE FILTER REQUIRED FLUSHOUT OPERATION Natural Ventilation w/ Fintube Radiation and Office General Exhaust N/A 25.8 Days System Type 3

Gymnasium Recirculation H&V Unit w/ HW Heat MERV 13 – 2” Filter 25.8 Days System Type 1

Cafeteria Recirculation H&V Unit w/ HW Heat MERV 13 – 2” Filter 25.8 Days System Type 1

Kitchen Recirculation H&V Unit w/ HW Heat MERV 13 – 2” Filter 25.8 Days System Type 1

Typical Classroom UV’s w/ AC & HW Heat MERV 8 – 2” Filter 25.8 Days System Type 2

Auditorium Recirculation H&V Unit w/ HW Heat MERV 13 – 2” Filter 25.8 Days System Type 1

Platform Recirculation H&V Unit w/ HW Heat MERV 13 – 2” Filter 25.8 Days System Type 1

Industrial Arts Recirculation H&V Unit w/ HW Heat MERV 13 – 2” Filter 25.8 Days System Type 1

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SEQUENCES OF OPERATION:

System Type 1 Re-circulation style heating & Ventilation unit with heating, and supply fan 1. Unit shall operate in occupied mode 24/7 for Building Flushout. 2. Supply Fan shall start and continue to run at full design speed. 3. Outside Air Damper & Re-circulation Air Damper shall be fixed and ventilation airflow to mix with the re-circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly- positive space pressure. 5. Hot Water Heating Section shall modulate to maintain discharge air temperature. 6. Unit shall run constantly to deliver constant ventilation to the spaces. 7. Damper failure, duct-mounted smoke detector (As-applicable), high discharge air temp, or low discharge air temp shall shutdown the unit and generate an alarm. 8. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 9. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy. System Type 2 Unit Ventilator & Separate Associated Exhaust System: 1. Unit shall operate in occupied mode 24/7 for building flushout. 2. Supply fan shall start or continue to run at full design speed. 3. Face & Bypass dampers (where applicable) shall modulate to max occupied position to allow the proper ventilation airflow to mix with the re-circulated room air. 4. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly-positive space pressure. 5. Electric Heating coil shall modulate as delegated by the unit controller to maintain the discharge air temperature set-point when/if there is a call for heating from the space temperature sensor. 6. Unit shall run constantly to deliver constant ventilation to the space. 7. Inspect condition of existing filters. Install new filters if needed prior to flushout and change filters after to flushout. Inspect filters quarterly thereafter and replace if needed. Assure gaps are sealed around filters. 8. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy. System Type 3 Natural Ventilation and Associated Exhaust System: 1. Associated Exhaust system shall start and continue to run at a constant speed to maintain a slightly-negative space pressure to allow infiltration through exterior windows and doors. 2. HW Fintube radiation shall modulate the hot water valve as delegated by the thermostat to maintain the space temperature set-point. 3. System shall be run in occupied mode 2 hours prior to occupancy to allow at least 2.0 air changes prior to occupancy. Hot Water Boiler: 1. Insure existing heating water has water inhibitors, a minimum of 20% glycol by volume. 2. Check control system and control devices for proper operation. Page - 88 GARCIA • GALUSKA • DESOUSA Consulting Engineers Inc.

3. Check pumps and variable-frequency drives (where installed) for proper operation. 4. For Boilers with natural gas systems, check gas pressure, gas valve operation, combustion flue gas venting and combustion air systems (including combustion air fans if installed) 5. Verify proper operation of all safety devices. 6. If necessary, vent air from distribution system high points. 7. Verify expansion/compression tank pressures to ensure proper operations. 8. Verify operating temperature of original design. Further Recommendations: 1. Install portable HEPA filters in each space where ventilation rate is less than 2.0. Based upon the calculation for typical spaces each occupied space is recommended to have a portable HEPA filter with 400 CFM of recirculation air. We recommend the HEPA filters run 2 hours prior to occupancy and during occupancy. 2. Consider installation of UV-C filters on the supply side of HVAC units. We recommend the HVAC units run 2 hours prior to occupancy and during occupancy. 3. Increasing humidity in winter to 40% will require a duct mounted humidifier or space type humidifier.

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AIR CHANGE CALCULATIONS:

Note: Kitchen area is removed from the average number above.

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CLEANING AND DISINFECTING PROCEDURES

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CLEANING AND DISINFECTING PROCEDURES The following is from a previous study done by EH&E as a consultant to GGD, the information is relevant based up on the site survey conducted on Friday August 14, 2020 by Universal Engineering:

GUIDANCE FOR CLEANING AND DISINFECTION To minimize transfer of coronavirus in City of Cambridge buildings, cleaning methods will be employed to reduce risk to staff and visitors to reduce risk of exposure to the virus that causes COVID-19. Cleaning methods should follow U.S. Centers for Disease Control and Prevention (CDC) guidance. 1, 2 For all three phases of re-opening, CDC recommends closing communal use spaces wherever possible, or staggering the use of communal• spaces, if they cannot be closed. Recommended methods for typical cleaning procedures include two-stage cleaning and disinfecting. 3 "Cleaning" entails washing with a detergent and water to remove soil, organic matter, and some microorganisms from a surface. Following a detergent and water wash, "disinfecting" entails use of a U.S. Environmental Protection Agency (EPA)-approved disinfectant that must be applied in accordance with product manufacturer guidelines. Refer to the EPA List of Disinfectants for Use Against SARS-CoV2.4

TRAINING AND PERSONAL PROTECTIVE EQUIPMENT (PPE) FOR CLEANING STAFF Cleaning staff should receive, at minimum, awareness training on cleaning and disinfection products used in the workplace following U.S. Occupational Safety and Health Administration (OSHA) Hazard Communication Standards. 5 Training should include proper use of disinfectants, PPE, disposal, and all precautionary measures. When using any cleaning product, ensure that cleaning staff has reviewed the product labels and Safety Data Sheets (SDS) and are following manufacturer specifications. Ensure that supplemental information on cleaning and disinfectant products are included in organization's hazard communication training. Individuals working with the recommended disinfecting products on the EPA list should wear proper PPE required by the product and outlined in the SDS. The best practice is to require eye protection, disposable gloves, and wearing uniforms for all tasks in the cleaning process, including handling trash. Gowns/aprons may also be appropriate for some tasks, such as preparing cleaning solutions. When finished, all cleaning staff should remove gowns/aprons first, being careful not to contaminate the surrounding area. Next gloves are to be removed by grasping from the inside and peeling inside out. Hands must be thoroughly washed for at least 20 seconds using soap and water. If soap and water are not available and hands are not visibly dirty, an alcohol-based hand sanitizer that contains 60%-95% alcohol may be used. However, if hands are visibly dirty, always wash hands with soap and water.

1 https://www .cdc .gov/coronavirus/2019-ncov /community /disinfecting-building-facility .html 2 https://www.cdc.gov/coronaviru s/2019-ncov/community/reopen-guidance.html 3 https://www .cdc .govIcoronavirus/2019-ncov /community /disinfecting-bui lding-facility.htm 1 4 https://www.epa.gov/pesticide-registration/list-n-disinfectants-use -against-sars-cov-2 5 OSHA 29 CFR 1910.1200. Occupational Safety and Health Standards. Code of Federal Regulations . Title 29, Part 1910, Section 1200, Hazard Communication. Washington , DC: U.S. Occupational Safety and Health Administration.

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CLEANING METHODS

Cleaning Solution Selection and Preparation

For cleaning, general purpose cleaners that are ready to use or diluted with water per product instructions are sufficient and should be used according to manufacturer's instructions. For disinfection, products that are specific to coronavirus, that have an "emerging viral pathogen" claim, and are on the EPA list 6 that require less than one minute of contact time are preferred. Make sure products have not passed their expiration date. If disinfecting products are not available, a dilute bleach solution can be used, comprising four teaspoons of bleach to a quart of water. Many disinfecting products can be skin and respiratory irritants. Green Seal, a non-profit certification organization, recommends selecting products with the following active ingredients:

• Hydrogen peroxide • Citric acid • Lactic acid • Ethyl alcohol (also called ethanol) • Isopropyl alcohol (70%) • Hypochlorous acid

NOTE: Many of the products on the EPA list contain either quaternary ammonium or sodium hypochlorite (also known as bleach). Cleaning products containing these two ingredients should not be used together or even in series, meaning one after the other. Disinfectant products should be kept out of reach of children.

Prepare Detergent Spray Solution

1. Any staff member preparing spray bottles with detergent must wear eye protection/goggles and gloves and follow manufacturer recommendations.

2. Using the manufacturer's instructions, fill spray bottle with the appropriate amount of detergent solution and water, if the manufacturer recommends dilution. A funnel (not to be used for consumables) can be used to reduce spills and splashing. 3. Replace the spray cap and label the bottle with the contents using a permanent marker.

4. The detergent manufacturer's instructions must be provided to all staff carrying out cleaning activities, and applicable SDS will be kept on file.

Prepare Disinfectant Spray Solution

1. Any staff member preparing spray bottles with disinfectant must wear eye protection/goggles and gloves and follow manufacturer's instructions. 2. Using the manufacturer's instructions, fill spray bottle with the appropriate amount of disinfectant solution and water, if the manufacturer recommends dilution. A funnel (not to be used for consumables) can be used to reduce spills and splashing.

6 https ://www.epa.gov/pesticide-registration/ list-n-disinfectants-use -against-sars-cov-2

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3. A dilute bleach (sodium hypochlorite) solution can be used by adding 4 teaspoons of bleach per quart of water.

4. Replace the spray cap and label the disinfectant bottle with the contents using a permanent marker. 5. The disinfectant manufacturer's instructions must be provided to all staff carrying out cleaning activities, and applicable Safety Data Sheets will be kept on file.

Typical Cleaning and Disinfection for Non-Porous Surfaces

• Cleaning staff should wear eye protection and disposable gloves.

• Using a detergent cleaning solution, spray 6 to 8 inches from the non-porous surface and wipe with clean paper towels (or according to manufacturer's instructions) to remove visible contamination, if present.

• Make sure the surface is dry before applying disinfectant.

• Review the instructions provided by the disinfectant manufacturer to note the concentration, application method, and necessary contact time. This will vary by product and type of cleaning activity.

• Allow the disinfectant to remain on the surface for the instructed time and wipe with paper towels. • After a cleaning task is complete, remove the gown followed by the gloves and dispose, as discussed in the "PPE for Cleaning Staff ' section above. Carefully wash hands for at least 20 seconds with soap and water as described the PPE section. Hand sanitizer may be used if water is not available and no visible dirt is observed on hands.

• Reusable aprons or work clothing may be used, if laundered or washed after use.

Typical Cleaning for Porous Surfaces CDC recommends removing or limiting use of soft and porous materials, such as area rugs and couches, as they are more difficult to clean and disinfect. At this time few products for use on porous surfaces are EPA approved. Products identified contain the active ingredients quaternary ammonium and hydrogen peroxide, both of which should be used carefully by trained staff. In addition, some products' manufacturer's instructions note that they are not approved for use in California. • Eye protection, gloves, and gowns/aprons should be worn during cleaning activities. • First remove visible contamination, if present, and clean with appropriate cleaners indicated for use on porous surfaces. • Launder items, if applicable, in accordance with the manufacturer's instructions using the warmest appropriate water setting for the items and then dry items completely. See Laundry section below. • Otherwise, use disinfectant products suitable for porous surfaces. NOTE: If some porous surfaces are not suitable for cleaning with disinfectants, then clean them as much as possible and attach signs to them saying they are not to be used or touched for three days.

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CLEANING IN SPECIFIC AREAS

Increased Frequency of Cleaning Cleaning should continue to follow typical practices. However, the frequency of cleaning must be increased for all facilities when in use. The following recommendations outline good, better and best practices when dealing with high traffic and frequently occupied spaces including but not limited to tables, doorknobs, light switches, countertops, handles, desks, phones, keyboards, toilets, faucets and sinks, gas pump handles, touch screens, and ATM machines.

Communal/Common Spaces • Good practice: Cleaning and disinfecting of communal spaces at least daily. • Better practice: Cleaning and disinfecting of communal spaces multiple times daily. • Best practice: Cleaning and disinfecting of communal spaces between groups. Disinfection after cleaning may not be feasible if scheduling of group activities does not allow for disinfectant to remain on treated surfaces for sufficient time to fully disinfect.

Shared Items • Good practice: Cleaning and disinfecting of shared items between uses. • Best practice: Assigning items where possible to reduce the quantity of items shared. Also, cleaning and disinfecting of shared items between uses.

Frequently Touched Surfaces

• Good practice: Cleaning and disinfecting frequently touched surfaces and common spaces at least daily. • Best practice: Cleaning and disinfecting frequently touched surfaces and common spaces multiple times daily. Examples of frequently touched surfaces include tables, drinking fountains, door handles, hand railings, light switches, countertops, cabinet handles, desks, keyboards, toilets, faucets, copiers, and laboratory equipment. Any other surfaces frequently touched by people should be cleaned and disinfected at least daily or, preferably, several times per day.

Changing Areas/Locker Rooms

• Good practice: As with other frequently touched surfaces, changing areas or locker rooms are cleaned and disinfected daily. • Better practice: High touch surfaces within changing areas or locker rooms are cleaned and disinfected more than once per day. • Best practice: High touch surfaces in changing areas and locker rooms are cleaned and disinfected between users.

Toilets, Showers, Restrooms • Good practice: As with other frequently touched surfaces, toilets, showers, and restrooms are cleaned and disinfected daily. • Better practice: High touch surfaces within toilets, showers, and restrooms are cleaned and disinfected more than once per day. • Best practice: High touch surfaces within toilets, showers, and restrooms are cleaned and disinfected between users.

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Outdoor Areas For outdoor areas, cleaning without disinfecting is recommended to conserve supplies of disinfectant; disinfectant has not been shown to reduce the outdoor risk of COVID-19 infection to the public. Cleaning of outdoor structures made of plastic or metal can be carried out according to typical cleaning practices. More frequent cleaning of high touch outdoor surfaces, such as railings and outdoor dining furniture, is recommended. Outdoor wooden surfaces, such as outdoor seating, can be cleaned according to standard practices and more frequently if needed to remove obvious soiling.

Support Spaces Routine cleaning for support spaces such as janitor's closets, electrical rooms, and supply closets, does not need to be increased if not frequently accessed spaces. However, it is recommended to clean and disinfect frequently touched surfaces after each use.

Dining Hall/Cafeterias

Cleaning and Disinfecting Food Contact Surfaces • Use soap or detergent and water to wash food contact surfaces (i.e. dishware, utensils, trays, food preparation surfaces, beverage equipment) then rinse after use. Best practice: Disinfect food contact surfaces before food preparation. Ensure any disinfectants used appear on • EPA' s list and are safe for food contact surfaces. Follow manufacturer instructions. • Let dishware and equipment airdry; do not dry with towels. • Ensure that dishwasher machines are operating within the manufacturer's specifications and that appropriate water temperatures, detergents, and sanitizers are being used.

Cleaning and Disinfecting Non-Food Contact Surfaces • Clean and disinfect frequently touched non-food contact surfaces in the kitchen and dining area at least daily. Best practice: Clean and disinfect the dining area before and after each use. • Clean and disinfect non-food contact surfaces in the kitchen and dining area's commonly touched surfaces (e.g. counters, tables, chairs, coffee pot handles) daily. Best practice: Clean and disinfect commonly touched surfaces before and after each use. • If hard non-porous surfaces are visibly dirty, clean them with detergent or soap and water before disinfecting following the guidance outlined above. • If soft or porous surfaces (e.g. fabric seats, upholstery) are visibly dirty, clean them using appropriate cleaners following the guidance outlined above. • Remove and dispose of gloves, facemasks, and gowns/aprons (if applicable) immediately after cleaning and disinfecting or when visibly soiled. • Immediately after cleaning and disinfecting (and before taking breaks), wash hands using soap and water for at least 20 seconds. If a handwashing station is not available, disinfect hands using alcohol- based hand sanitizer. • If disposable gowns are not worn, immediately launder clothes worn using the warmest appropriate water and dry completely. Wash hands immediately after handling dirty laundry.

Cleaning of Keyboards, Laptops and Electronic Equipment When cleaning electronic equipment, it is important to follow the manufacturer guidelines. Use of covers that can be cleaned and disinfected are recommended. In addition, alcohol wipes or sprays containing at least 70% alcohol can be used to disinfect electronics, including touch screens.

LAUNDRY • Common surfaces should be cleaned after each use (e.g., control dials, door handles, etc.) • For items worn by staff that requires laundering, it is recommended to send to a qualified launder after use. If laundry is done in house, it is recommended to conduct the following: - As with other cleaning activities, gloves and gowns/aprons are recommended when doing laundry. Facemasks are also recommended.

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- Staff should avoid shaking laundry items. - Use of a disinfectant appropriate for porous material is recommended. Example: Lysol laundry detergent - for laundry. - Wash items as appropriate in accordance with the manufacturer's instructions, opting for the warmest appropriate water setting for the items and dry items completely. - Clean and disinfect hampers or other carts for transporting laundry according to guidance above for hard or soft surfaces. - Cloth face coverings used by staff should be laundered regularly. Used face coverings should be collected in a sealable container (like a trash bag) until laundered.

CLEANING IN THE EVENT OF CONFIRMED OR PROBABLE CASE OF COVID-19

Cleaning Procedure If more than 7 days have passed since the person who is sick visited or used the facility, additional cleaning and disinfection is not necessary. Continue routine cleaning and disinfection. If less than 7 days, close off areas that were used by the person and carry out the following: • Open outside doors and windows to increase air circulation in the areas, if possible. • Wait up to 24 hours or as long as possible before you clean or disinfect the space to allow respiratory droplets to settle before cleaning and disinfecting. • Clean and disinfect all areas used by the person. Run ventilation system during cleaning. • Use dedicated cleaning and disinfecting materials to disinfect a potential source area (e.g., an infected employee office). The cleaning equipment should not be used to clean other areas until they are thoroughly cleaned and disinfected. • Enhanced or deep cleaning is recommended if it is determined that a person with COVID-19 was in housing or communal areas for at least 15 minutes. For a suspected or confirmed case, the following deep cleaning protocol should be followed:

• First clean visibly dirty surfaces then perform disinfection. For specific cleaning instructions see sections above: "Typical Cleaning for Non-Porous Surfaces" and "Typical Cleaning for Porous Surfaces." • Use disposable wipes/paper towels to clean surfaces if possible, rather than reusable cloth wipes, as the latter can re-contaminate surfaces. All cleaning and disinfecting materials (e.g., paper towels, cloth wipers, sponges, mop heads, etc.) should be disposed in sealed bags or containers after use. • In each area, pay particular attention to high touch areas, including, but not limited to, handrails, door handles, cabinet and drawer handles, shared sports equipment, or craft tools. Clean and disinfect an area extending 12 feet in all directions around the work area, focusing on all horizontal surfaces and high touch objects. Clean and disinfect areas identified during the interview as locations visited, used, or occupied including the entire bathroom and any common or activities areas. These include high touch objects in common areas including handrails, exterior door entry handles, cabinet handles, and restroom door handles, as well as crafting tools or sports equipment. • Use dedicated cleaning and disinfecting materials to disinfect a potential source area. These materials should not be used to clean other areas until they are thoroughly cleaned and disinfected. • Clean a potential source area by progressing from the entrance to the most distant point to avoid re- contaminating surfaces that have been disinfected (i.e., clean your way out). • Clean soft and porous surfaces such as carpeted floor, rugs, and drapes also using the procedure noted above for porous surfaces. NOTE: If some porous surfaces are not suitable for cleaning with disinfectants, then clean them as much as possible and attach a sign to them saying they are not to be used or touched for three days.

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Personal Protective Equipment • Cleaning staff should wear eye protection, disposable gloves, and gowns/aprons for all tasks in the cleaning process, including handling trash. • Gloves and gowns/aprons should be compatible with the disinfectant products being used. • Disposable facemask. • Additional PPE might be required based on the cleaning/disinfectant products being used and whether there is a risk of splash, for example a face shield. • Gloves and gowns/aprons should be removed carefully to avoid contamination of the wearer and the surrounding area. Be sure to clean hands after removing gloves. • Gloves should be removed after cleaning a room or area occupied by ill persons. Clean hands immediately after gloves are removed. • Cleaning staff should immediately report breaches in PPE (e.g., tear in gloves) or any potential exposures to their supervisor. • Cleaning staff and others should clean hands often, including immediately after removing gloves and after contact with an ill person, by washing hands with soap and water for 20 seconds. If soap and water are not available and hands are not visibly dirty, an alcohol-based hand sanitizer that contains 60%-95% alcohol may be used. However, if hands are visibly dirty, always wash hands with soap and water.

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