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This project committee is responsible for maintaining ASHRAE Standard 62.2,
Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings

Standard 62.2-2010 -- Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings (ANSI/ASHRAE Approved)

Standard 62.2 was first published in 2003 as the first national ventilation and indoor air quality (IAQ) standard developed specifically for low-rise residential buildings via the ANSI process. It has been maintained since then using the ANSI and ASHRAE continuous maintenance procedures. Users of the standard are encouraged to use these procedures to propose changes to the standard. The committee will consider and take formal action on every proposal received. Forms and procedures for submitting change proposals may be found on ASHRAE’s Web site at www.ashrae.org. When proposed addenda are available for public review and when approved addenda are published, notices will be published on ASHRAE’s Web site. The standard is now published in its entirety every third year and includes all approved addenda and errata. This procedure allows users to have certainty about when the new editions will be published. This 2010 edition incorporates the content of 20 addenda into the 2007 version, which were processed by the committee and approved by ASHRAE and ANSI. For brief descriptions of the addenda to ANSI/ASHRAE 62.2-2007, see Appendix B.

When this standard was published in 2004 and 2007, relatively few changes were made to the original 2003 version. However, since 2003, extensive experience has been gained in the application of this standard, due to its adoption by various building codes and use in numerous building programs. As such, many clarifications and improvements have been identified and incorporated through the approved addenda. However, as discussed below, the standard follows the same overall approach as before, and mechanical ventilation rates have not been changed. One significant addition is the addition of a new normative appendix addressing the application of the standard to existing buildings. This appendix allows some optional pathways for previously occupied buildings, which are intended to overcome barriers to application of the standard in existing buildings.

As in the previous versions of this standard, there are three primary sets of requirements and a number of secondary ones. The three primary sets involve whole-house ventilation, local exhaust, and source control. Whole-house ventilation is intended to dilute the unavoidable contaminant emissions from people, from materials, and from background processes. Local exhaust is intended to remove contaminants from those specific rooms (e.g., kitchens and bathrooms) that, because of their design function, are expected to contain sources of contaminants. Other source control measures are included to deal with those sources that can be reasonably anticipated to be found in a residence. The standard’s secondary requirements focus on properties of specific items that are needed to achieve the main objectives of the standard. Examples of this include sound and flow ratings for fans and labeling requirements.

This standard does not address specific pollutant concentration levels. It also does not address certain potential pollutant sources such as unvented combustion space heaters and contamination from outdoor sources or from episodic occupant-controlled events such as painting, smoking, cleaning, or other high-polluting events. For information on residential ventilation and IAQ beyond the minimum requirements contained in this standard, users may wish to consult the companion guideline, which was also developed by this committee. ASHRAE Guideline 24-2008, Ventilation and Indoor Air Quality in Low-Rise Residential Buildings, provides explanatory and educational material not appropriate for a code-intended standard and addresses IAQ and ventilation issues where consensus could not be achieved for inclusion in the standard. Information previously contained in informative appendices to this standard (Operations and Maintenance and HVAC Systems) was moved to the guideline and will be maintained there in the future.

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ANSI/ASHRAE Standard 62.2 is under continuous maintenance by SSPC 62.2 for which the Standards Committee has established a documented program for regular publication of addenda or revisions.