ANSI/ASHRAE Addendum n to ANSI/ASHRAE Standard 62.2-2010 Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings Approved by the ASHRAE Standards Committee on January 21, 2012; by the ASHRAE Board of Directors on January 25, 2012; and by the American National Standards Institute on January 26, 2012. This addendum was approved by a Standing Standard Project Committee (SSPC) for which the Standards Committee has estab- lished a documented program for regular publication of addenda or revisions, including procedures for timely, documented, con- sensus action on requests for change to any part of the standard. The change submittal form, instructions, and deadlines may be obtained in electronic form from the ASHRAE Web site (www.ashrae.org) or in paper form from the Manager of Standards. The latest edition of an ASHRAE Standard may be purchased on the ASHRAE Web site (www.ashrae.org) or from ASHRAE Customer Service, 1791 Tullie Circle, NE, Atlanta, GA 30329-2305. E-mail: [email protected]. Fax: 404-321-5478. Telephone: 404-636-8400 (worldwide), or toll free 1-800-527-4723 (for orders in US and Canada). For reprint permission, go to www.ashrae.org/permissions. © 2012 ASHRAE ISSN 1041-2336 © ASHRAE (www.ashrae.org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission. ASHRAE Standing Standard Project Committee 62.2 Cognizant TC: TC 4.3, Ventilation Requirements and Infiltration SPLS Liaison: Robert G. Baker Steven J. Emmerich, Chair* Thomas P. Heidel Armin Rudd Don T. Stevens, Vice-Chair* Mark C. Jackson* Max H. Sherman David A. Baylon* Richard John Karg* Thomas R. Stroud* Terry M. Brennan* Glenn P. Langan Don Surrena* Roy R. Crawford* Joseph W. Lstiburek* John M. Talbott* David C. Delaquila* Michael R. Lubliner Iain S. Walker* Lance L. DeLaura Jane Malone* Eric D. Werling* S. Craig Drumheller James C. Moore* Bruce A. Wilcox* Philip W. Fairey, III* Amy B. Musser* Ted A. Williams Paul Francisco* Paul H. Raymer* *Denotes members of voting status when the document was approved for publication. ASHRAE STANDARDS COMMITTEE 2011–2012 Carol E. Marriott, Chair Krishnan Gowri Janice C. Peterson Kenneth W. Cooper, Vice-Chair Maureen Grasso Douglas T. Reindl Douglass S. Abramson Cecily M. Grzywacz Boggarm S. Setty Karim Amrane Richard L. Hall James R. Tauby Charles S. Barnaby Rita M. Harrold James K. Vallort Hoy R. Bohanon, Jr. Adam W. Hinge William F. Walter Steven F. Bruning Debra H. Kennoy Michael W. Woodford David R. Conover Jay A. Kohler Craig P. Wray Steven J. Emmerich Frank Myers Eckhard A. Groll, BOD ExO Allan B. Fraser Ross D. Montgomery, CO Stephanie C. Reiniche, Manager of Standards SPECIAL NOTE This American National Standard (ANS) is a national voluntary consensus standard developed under the auspices of ASHRAE. Consensus is defined by the American National Standards Institute (ANSI), of which ASHRAE is a member and which has approved this standard as an ANS, as “substantial agreement reached by directly and materially affected interest categories. This signifies the concurrence of more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that an effort be made toward their resolution.” Compliance with this standard is voluntary until and unless a legal jurisdiction makes compliance mandatory through legislation. ASHRAE obtains consensus through participation of its national and international members, associated societies, and public review. ASHRAE Standards are prepared by a Project Committee appointed specifically for the purpose of writing the Standard. The Project Committee Chair and Vice-Chair must be members of ASHRAE; while other committee members may or may not be ASHRAE members, all must be technically qualified in the subject area of the Standard. Every effort is made to balance the concerned interests on all Project Committees. The Manager of Standards of ASHRAE should be contacted for: a. interpretation of the contents of this Standard, b. participation in the next review of the Standard, c. offering constructive criticism for improving the Standard, or d. permission to reprint portions of the Standard. DISCLAIMER ASHRAE uses its best efforts to promulgate Standards and Guidelines for the benefit of the public in light of available information and accepted industry practices. However, ASHRAE does not guarantee, certify, or assure the safety or performance of any products, components, or systems tested, installed, or operated in accordance with ASHRAE’s Standards or Guidelines or that any tests conducted under its Standards or Guidelines will be nonhazardous or free from risk. ASHRAE INDUSTRIAL ADVERTISING POLICY ON STANDARDS ASHRAE Standards and Guidelines are established to assist industry and the public by offering a uniform method of testing for rating purposes, by suggesting safe practices in designing and installing equipment, by providing proper definitions of this equipment, and by providing other information that may serve to guide the industry. The creation of ASHRAE Standards and Guidelines is determined by the need for them, and conformance to them is completely voluntary. In referring to this Standard or Guideline and in marking of equipment and in advertising, no claim shall be made, either stated or implied, that the product has been approved by ASHRAE. © ASHRAE (www.ashrae.org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission. (This foreword is not part of this standard. It is merely [Revise Section 4 as shown below.] informative and does not contain requirements necessary for conformance to the standard. It has not been 4. WHOLE-BUILDING VENTILATION processed according to the ANSI requirements for a 4.1 Ventilation Rate. A mechanical exhaust system, supply standard and may contain material that has not been system, or combination thereof shall be installed for each subject to public review or a consensus process. dwelling unit to provide whole-building ventilation with out- Unresolved objectors on informative material are not door air each hour at a rate not no less than specified in Sec- offered the right to appeal at ASHRAE or ANSI.) tion 4.1.1, Fan Ventilation Rate Method, or Section 4.1.2, Total Ventilation Rate Method. FOREWORD 4.1.1 Fan Ventilation Rate Method. tThe mechanical SSPC 62.2 has responsibility for maintenance of ventilation rate shall be as specified in Tables 4.1a and or ASHRAE Standard 136. As such, a 136 subcommittee was Table 4.1b or, equivalently, Equations 4.1a and or Equation formed to update the standard. The 136 subcommittee rec- 4.1b, based on the floor area of the conditioned space and ommended and SSPC 62.2 concurred that the provisions of number of bedrooms. Standard 136 be incorporated directly into the body of Stan- Q = 0.01A + 7.5(N + 1) (4.1a) dard 62.2 and that Standard 136 be withdrawn when that is fan floor br accomplished. During the 136 subcommittee deliberations, where the SPC 119 committee recommended the withdrawal of Qfan = fan flow rate, cfm Standard 119. As a result of this decision, the 136 Subcom- A = floor area, ft2 mittee decided to include the pertinent provisions of Stan- floor dard 119 into Standard 62.2 as well so that all of these Nbr = number of bedrooms; not to be less than one provisions are in one place. This will save the user of Stan- Qfan = 0.05Afloor + 3.5(Nbr + 1) (4.1b) dard 62.2 from purchasing all three standards. The weather factors (W) that were contained in Standard 136 have been where updated to be consistent with the new TMY3 climate data for Qfan = fan flow rate, L/s 1020 climates using the expanded ASHRAE infiltration A = floor area, m2 model using shielding Class 4. The resulting values, which floor N = number of bedrooms; not to be less than one have been renamed as weather and shielding factor (wsf) br values to differentiate them from the old W factors, are sig- Exceptions: Whole-building mechanical systems are not nificantly lower than the original values but are believed to required provided that at least one of the following con- be much closer to reality than the previous values, which ditions is met: have been criticized by a number of technical experts as esti- a. the building has no mechanical cooling and is in zone mating infiltration rates that are significantly greater than 1 or 2 of the IECC 2004 Climate Zone Map (see Fig- those measured in the field. ure 8.2), or This addendum incorporates a revised method of calcu- b. the building is thermally conditioned for human lating infiltration airflow using normalized leakage, with a occupancy for less than 876 h per year, revised height adjustment exponent, and the revised wsf val- ues. This infiltration airflow rate would then be used to and if the authority having jurisdiction determines that determine the required mechanical ventilation fan flow rate window operation is a locally permissible method of requirement for meeting the standard. providing ventilation. Note: In this addendum, changes to the current standard are indicated in the text by underlining (for additions) and TABLE 4.1a (I-P) strikethrough (for deletions) unless the instructions specifi- Ventilation Air Requirements, cfm cally mention some other means of indicating the changes. Bedrooms Floor Area, ft2 Addendum n to Standard 62.2-2010 0–1 2–3 4–5 6–7 >7 <1500 30 45 60 75 90 [Add a new definition to Section 3 as follows.] 1501–3000 45 60 75 90 105 3. DEFINITIONS 3001–4500 60 75 90 105 120 effective annual average infiltration rate: the constant air 4501–6000 75 90 105 120 135 infiltration rate that would result in the same average indoor 6001–7500 90 105 120 135 150 pollutant concentration over the annual period as actually occurs under varying conditions.