Standard 62.2-2016 -- Ventilation and Acceptable Indoor Air Quality in 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. Readers 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 website at www.ashrae.org or at the end of this standard. When proposed addenda are available for public review and when approved addenda are published, notices will be published on ASHRAE’s website. 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 2016 edition incorporates the contents of 17 addenda into the 2013 edition, which were processed by the committee and approved by ASHRAE and ANSI. For brief descriptions of the addenda to ANSI/ASHRAE Standard 62.2-2013, see Informative Appendix D.
Through 2007, relatively few changes were made. However, since then, 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. Additionally, the science regarding indoor air quality and its relationship to health has advanced significantly. As such, many clarifications and improvements have been identified and incorporated since 2007, including through the approved addenda for the 2016 edition. Major changes since the 2013 edition include two scope changes: the inclusion of unvented space heaters as a potential contaminant source that the standard can address, and the expansion of covered dwellings to include all multifamily dwelling units regardless of building height. Other major changes include a de minimus calculated mechanical ventilation rate of 15 cfm to require the installation of mechanical ventilation in existing homes (addendum b); a distinction between range hoods and other kitchen ventilation options (addendum c); a method for determining an infiltration credit for horizontally-attached multifamily dwelling units (addendum j); and a method for determining requirements for a variety of noncontinuous ventilation strategies (addendum v). Addendum v also implements a maximum short-term relative exposure limit for the first time, in addition to the traditional use of annual dose.
As in the previous editions of this standard, there are three primary sets of requirements and a number of secondary ones. The three primary sets involve whole-building ventilation, local demand-controlled exhaust, and source control. Whole-building ventilation is intended to dilute the unavoidable contaminant emissions from people, from materials, and from background processes. Local demand-controlled exhaust is intended to remove contaminants from 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 include sound and flow ratings for fans, controls, and labeling requirements.This standard does not address specific pollutant concentration levels. It also does not address certain potential pollutant sources such as 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 the Standard 62.2 committee. ASHRAE Guideline 24-2015, 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.