DIVISION 15 – MECHANICAL WARREN-TRUMBULL PUBLIC LIBRARY BROOKFIELD BRANCH – BROOKFIELD, OH
SECTION 15910 DUCTWORK ACCESSORIES
PART I GENERAL
1.1 RELATED REQUIREMENTS
1. The provisions of the Instructions to bidders General Conditions Supplementary Conditions, Alternates, Addendas and Division 1 are a part of this Specification. Contractors and Sub Contractors shall examine same, as well as other Divisions of the Specifications, which affect work under this Division.
2. Mechanical, Architectural, Structural, Electrical and all other Drawings, as well as the Specifications for all the Divisions, are a part of the Contract Documents.
3. Drawings and Specifications are to be considered as supplementing each other. Work specified but not shown, or shown but not specified, shall be performed or furnished as though mentioned in both Specifications and Drawings.
1.2 DESCRIPTION OF WORK
1. Access doors/panels.
2. Fire and smoke dampers.
3. Balancing dampers.
4. Back draft dampers.
5. Turning vanes.
6. Deflectors/air extractors.
7. Flexible connections.
8. Motorized dampers.
9. Damper motor operators.
10. Ductwork access doors.
11. Duct test holes.
12. Duct joint fittings.
1.3 REFERENCE STANDARDS
1. National Fire Protection Association (NFPA):
A. NFPA 90A - Air Conditioning and Ventilating Systems
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2. American Society of Heating, Refrigeration and Air Conditioning Engineers, Inc. (ASHRAE):
A. ASHRAE - Applicable ductwork manuals
3. Sheet Metal and Air Conditioning Contractor's National Association (SMACNA):
A. SMACNA - Applicable ductwork manuals
4. Underwriter's Laboratories, Inc. (UL):
A. UL 33 - Fusible Links for Fire Protection Service
B. UL 555 - Building Materials Directory
1.4 QUALITY ASSURANCE
1. Fire Dampers, Smoke Dampers and Combination Fire and Smoke Dampers: Shall be UL listed, labeled and constructed in Accordance with UL 555 Fire Dampers. (1-1/2 hr. rating)
A. Install fire, smoke and combination dampers in accordance with SMACNA Manual - Fire, Smoke and Radiation Damper Installation Guide for HVAC Systems, latest edition.
2. Fusible Links: Fire dampers with fusible links shall be constructed in accordance with requirements of UL 33.
3. Fabricate all ductwork in accordance with ASHRAE handbooks and SMACNA duct manuals.
A. Accessories shall meet the requirements of NFPA 90A.
1.5 SUBMITTALS
1. Shop Drawings, Product Data and Samples: Submit under provisions of specifications.
2. Shop Drawings: Submit shop drawings of factory fabricated assemblies.
3. Product Data: Submit manufacturers' descriptive literature and printed installation instructions.
4. Samples: Submit samples of shop fabricated assemblies as requested.
PART II PRODUCTS
2.1 ACCEPTABLE MANUFACTURERS
1. Fire Dampers, smoke dampers and combination fire/smoke dampers, volume control dampers, back draft dampers, motorized dampers:
A. Ruskin Manufacturing Inc., Grandview, MO or equal. Combination Fire/Smoke Damper Model FSD-60, Smoke Damper Model SD-50.
B. Prefco Products Inc., Buckingham, PA. 00048KB DUCTWORK ACCESSORIES 15910 - 2 DIVISION 15 – MECHANICAL WARREN-TRUMBULL PUBLIC LIBRARY BROOKFIELD BRANCH – BROOKFIELD, OH
C. United McGill Corp., Westerville, OH.
2. Access Doors/Panels:
A. Ruskin Manufacturing Inc., Grandview, MO.
B. Inryco, Inc., Milcor Div.
C. United McGill Corp., Westerville, OH.
3. Flexible Connections:
A. Ventfabrics, Inc.
B. Hart & Cooley, Inc.
C. Barb-Aire Inc.,
4. Turning Vanes:
A. Barb-Aire Inc., Huntsville, AL.
B. Hart & Cooley Inc., Holland, MI.
C. Titus Products, Richardson, TX.
5. Duct Joint Fittings:
A. Ductmate System, Ductmate Industries Inc., Pittsburgh, PA.
6. United McGill Corporation
A. Simco Mfg, Co,
7. Substitutions: Items of equal function and performance will be considered.
2.2 DUCTWORK ACCESS DOORS - (AD)
1. Access Doors/Panels: Refer to Architectural Sections for ACCESS DOORS for requirements. Furnish and deliver to the General Contractor for installation.
2. Access doors/panels are NOT REQUIRED at ceilings with exposed grid and lay-in ceiling tile.
2.3 COMBINATION FIRE AND SMOKE DAMPERS
1. Locations: Install at locations indicated.
2. Leakage Rated Fire/Smoke Dampers: For use in a smoke control system, shall be UL 555, 1-1/2 hr. labeled. The leakage rating shall be no higher than 10 CFM/sq.ft. @ 1.0 inch WG, 250 degrees F elevated temperature category. Elevated temperature to also apply to operators as well as dampers.
3. Firestat: Each damper shall be equipped with a UL listed firestat; Model TS150 as manufactured by Ruskin or equal. Firestat shall function to close damper when duct temperature exceeds 212 00048KB DUCTWORK ACCESSORIES 15910 - 3 DIVISION 15 – MECHANICAL WARREN-TRUMBULL PUBLIC LIBRARY BROOKFIELD BRANCH – BROOKFIELD, OH
degrees F (or 165 degrees F as selected by local authority). Firestat package shall include two (2) damper position switches, both linked to damper blade to provide remote indicating damper position. One switch shall close when damper is fully open, the other shall open when the damper is fully closed. Firestat and damper position indicators shall interface with smoke detectors building fire alarm system and remote indicating/control sections.
4. Electric Locking Capability: Damper and position indicators shall have the capability of electrically locking damper in the closed position when duct temperature exceeds 212 degrees F ( or 164 degrees F as selected by local authority) and still permit authorized personnel to override and re-open damper as required, to permit desired smoke control functions.
5. Damper Frames: Shall be of 16 gauge galvanized steel construction. Bearings shall be stainless steel sleeves pressed into frame. Axles shall be 1/2 inch plated steel hex. Damper shall include an operating shaft which when rotated 90 degrees will cause damper to operate between closed and open. This operating shaft and damper combination shall be suitable for linking to and operated by any standard electric or pneumatic damper motor, having sufficient torque characteristics to operate the size damper required.
6. Blade Shape: Damper shall incorporate double skin aerofoil shaped blades, with 14 gauge equivalent thickness and maximum 6-inch width, for minimum pressure loss in the open position. Manufacturer shall submit certified test data taken in accordance with AMCA Standard 500 showing proposed damper pressure drop, in open position, is less than 0.01 inch WG with average velocities of 2,500 FPM.
2.4 SMOKE DAMPERS
1. Smoke dampers shall be of same construction and type as specified under Article 2.3 except without fusible link.
2.5 FIRE DAMPERS
1. Furnish and install, fire dampers constructed and tested in accordance with UL Safety Standard 555.
2. Each fire damper shall have a 1-1/2 hr. fire protection rating, 212 degrees F fusible link (or 165 degrees F as selected by local authority) and include a UL label in accordance with established UL labeling procedures.
3. Damper manufacturer's literature, submitted for approval prior to installation, shall include comprehensive performance data developed from testing in accordance with AMCA Standard 500, and shall illustrate pressure drops for all sizes of dampers required at all anticipated air flow rates.
4. Fire damper shall be equipped complete with corrosion resistant springs, bearings, bushings and hinges for vertical or horizontal operation and installation as required by the location shown.
5. Fire dampers shall be installed in wall and floor openings utilizing steel sleeves, angles, other materials and practices required to provide an installation equivalent to that utilized by the manufacturer when dampers were tested at UL.
6. Installation shall be in accordance with the damper manufacturer's instructions. Fire dampers shall by Type BIBD2, Style B, as manufactured by Ruskin, or equal as approved by Engineer/Architect.
7. Fire dampers shall be installed in all firewalls 1-1/2 hr. rated or above, and also at locations as 00048KB DUCTWORK ACCESSORIES 15910 - 4 DIVISION 15 – MECHANICAL WARREN-TRUMBULL PUBLIC LIBRARY BROOKFIELD BRANCH – BROOKFIELD, OH
indicated.
8. Dampers may be smoke/fire combination type, see Drawings for type required.
2.6 BALANCING/VOLUME CONTROL DAMPERS
1. Fabricate of galvanized steel, minimum 16 gage and provide with quadrants or adjustment rod and lock screw.
2. Fabricate splitter dampers of double thickness sheet metal to streamline shape, properly stiffened to avoid vibration. Size on basis of straight air volume proportioning.
3. Fabricate single blade dampers for duct sizes to 9-1/2 inches X 30 inches, 12 inches X 48 inches.
4. Fabricate multi-blade damper of opposed blade pattern with maximum blade sizes 12 inch X 72 inch. Assemble center and edge crimped blade in prime coated or galvanized channel frame with suitable hardware.
5. Construct damper blades for medium and high-pressure systems to block a maximum of 70 percent of the air passage. Supply locking type handles.
6. Opposed blade dampers shall be used for air volume control and parallel blade dampers shall be used for air mixing.
7. For volume control dampers, install end bearings with rubber gaskets on the outside of ducts or frames to prevent air leakage around damper shaft and for smooth operation.
8. Install motor operators on dampers as directed.
2.7 BACKDRAFT DAMPERS
1. Fabricated multi-blade parallel action gravity balanced back draft dampers shall be installed at locations specified and noted on the drawings.
2. Back draft dampers shall be factory made of 3 inch wide, 28 gauge aluminum louvers not over 24 inches in length, supported on substantial bronze or aluminum rods, in bronze graphite- impregnated or nylon bearings, set in 16 gauge frame and fitted with neoprene or felt on contact edges to prevent noise, linked together in rattle-free manner and with adjustment device to permit setting for varying differential static pressure.
3. Channel frame: Shall be fitted to duct, vent or wall opening and edges sealed airtight. Inside dimensions of channel frame shall not be less than the daylight opening of the grille so that frame is not visible with grille in place.
4. Power roof exhausters equipped with back draft dampers shall be furnished with dampers full- size of connecting collar.
2.8 TURNING VANES (DEFLECTORS)
1. Double-wall airfoil (formed) type turning vanes shall be installed at each change in direction of all square or rectangular supply air ductwork, and shall be factory-fabricated of size to suit ductwork. TURNING VANES CONSTRUCTED ON THE JOB WILL NOT BE ACCEPTED.
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2. Turning vanes are not required in ductwork with radius type bends.
3. Turning vanes shall be installed in return air or exhaust ducts only where shown or noted on drawings.
2.9 DEFLECTORS/AIR EXTRACTORS
1. Multi-blade device with radius blades attached to pivoting frame and bracket, steel or aluminum construction, with push-pull operator strap.
2.10 FLEXIBLE DUCT CONNECTIONS
1. Provide flexible connections at inlet and outlet of all exhaust fans and return air fans, air conditioning equipment and where shown on the drawings.
2. Fabricate in accordance with SMACNA Low Pressure Duct Construction Standards, as indicated.
3. UL listed fire-retardant, neoprene coated woven glass fiber fabric to NFPA 90A, minimum density 30 oz. per sq. yd., approximately 3 inches wide, crimped into metal edging strip.
4. Leaded vinyl sheet, minimum 0.55 inch thick, 0.87 lbs. per sq. ft., and 10 db. attenuation in 10 to 10,000 Hz range.
2.11 MOTORIZED DAMPERS
1. Furnish and install dampers complete with operators and controllers.
2. Dampers shall have not less than 13 ga. galvanized sheet steel frames and double 22 ga. galvanized sheet steel parallel blades with nylon bearings, seals along top, sides and bottom of frame and along each blade edge in integral ribbed groove inserts in frame and blades.
3. Seals shall be replaceable butyl rubber. GLUED OR RIVETED SEALS OR WEATHER- STRIPPING WILL NOT BE ACCEPTABLE.
2.12 DAMPER MOTOR OPERATORS
1. Motor operators, controllers and control sequence of all fire dampers and motorized dampers must be coordinated with Section 15975 - DIRECT DIGITAL CONTROL SYSTEM to be compatible with the temperature controls and fire alarm system.
A. Option: Should the Contractor choose, the motorized dampers, operators and controllers can be provided and installed by the temperature control manufacturer.
2. Operator shall be fully proportioning, and shall be capable of operating at rates of speed to correspond to the exact dictates of the controller and variable load requirements and selected to provide speed that will prevent cycling.
3. Positive positioners shall be installed on damper motors where required to provide sufficient 00048KB DUCTWORK ACCESSORIES 15910 - 6 DIVISION 15 – MECHANICAL WARREN-TRUMBULL PUBLIC LIBRARY BROOKFIELD BRANCH – BROOKFIELD, OH
power and accurate sequencing.
2.13 DUCT TEST HOLES
1. Cut or drill temporary test holes in ducts as required. Cap with neat patches, neoprene plugs, threaded plugs, or threaded or twist-on metal caps.
2. Permanent test holes shall be factory fabricated, airtight flanged fitting with screw cap. Provide extended neck fittings to clear insulation.
2.14 DUCT JOINT FITTINGS
1. Prefabricated fittings shall consist of 20 ga. angles, corner piece inserts, 20 ga. metal cleats, 16 ga. corner clips and extruded butyl gaskets for use between mating flanges.
2. Angles and cleats shall be of roll formed galvanized steel.
3. Assemble duct joint fittings according to manufacturers instructions.
PART III EXECUTION
3.1 INSTALLATION
1. Provide fire dampers and combination fire and smoke dampers at locations indicated, where ducts and outlets pass through fire rated components and where required by authorities having jurisdiction. Install with required perimeter mounting angles, sleeves, breakaway duct connections, corrosion resistant springs, bearings, bushings, motor operators and hinges.
2. Furnish and install manual locking quadrant opposed blade volume control dampers in each duct and each zone duct to facilitate air balancing and as indicated on the drawings. Furnish and install deflectors at all supply registers and diffusers. Note: Volume control dampers mounted in AC unit discharge ducts where required shall be heavy-duty airfoil type.
3. Install items in accordance with manufacturer's printed instructions and in accordance with recommendations outlined in the latest edition of SMACNA Duct Manuals.
4. Where ducts are concealed in chases or furred ceiling, access doors shall be provided to permit access to all dampers under this Contract.
5. Smoke damper and combination fire and smoke damper power wiring to the operator and interlock wiring between operator and smoke detector shall be under the electrical section. See temperature control portion of these specifications for additional wiring responsibilities.
6. Provide balancing dampers at points on low-pressure supply, return and exhaust systems where branches are taken from larger ducts as required for air balancing. Use splitter dampers only where indicated.
7. Demonstrate re-setting of fire dampers to authorities having jurisdiction and Owner's representative.
8. Provide back draft dampers on exhaust fans or exhaust ducts nearest to outside and where indicated. 00048KB DUCTWORK ACCESSORIES 15910 - 7 DIVISION 15 – MECHANICAL WARREN-TRUMBULL PUBLIC LIBRARY BROOKFIELD BRANCH – BROOKFIELD, OH
9. Provide duct access doors for inspection and cleaning before and after filters, coils, fans, automatic dampers, at fire dampers and elsewhere as indicated. Provide minimum 8 X 8 inch size for hand access, 18 X 18 inch size for shoulder access and as indicated. Where access is required to remove equipment filters, motors, etc., size shall be 150 percent of smallest device dimension.
10. Where ducts sections are required to be removable to provide access to systems of other trades, prefabricated duct joints shall be used.
11. All smoke detectors required to be installed in ductwork or related equipment for operation of smoke dampers, smoke exhaust fans and other devices will be furnished by the Electrical Contractor to the HVAC Contractor or temperature control subcontractor for installation.
12. Where fans are located up into the attic the Contractor is to furnish and install a 24 X 24 access door in the drywall under the fan for access at bottom of truss.
END OF SECTION
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