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ASHRAE Approves First Addenda to Residential IAQ Standard

September 06, 2004

The first addenda to the American Society of Heating, Refrigerating and Air-Conditioning Engineers’ (ASHRAE) residential ventilation standard have been approved for publication.

ANSI/ASHRAE Standard 62.2, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings, is the only nationally recognized indoor air quality standard developed solely for residences.

Addenda 62.2a and 62.2b were approved for publication at ASHRAE’s 2004 Annual Meeting. The addenda are the first for the standard, which was published in last year.

Addendum 62.2b changes the terminology “severe cold climate” to “very cold,” which is now defined as one that has more than 9,000 65∞F degree-days.

Addendum 62.2a removes combustion appliance backdrafting test requirements from the standard. The test was based on the best industry-accepted method found in the National Fuel Gas Code but questions arose about its application to solid-fuel burning appliances, according to David Grimsrud, chair of the Standard 62.2 committee. There also was concern about it not being possible to perform the test until the home is completed, opening the potential for having to perform remedial balancing at a difficult stage of construction and sale.

The addenda are subject to a 15-day appeals period to the Board of Directors. Published addenda to ASHRAE standards are available for free. To be notified when addenda become available, subscribe to the ASHRAE Standards Action list server via the Online Bookstore at ASHRAE webpage

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