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Change to ASHRAE Residential IAQ Standard
July 21, 2009

In a time when the U.S. economic stimulus plan is emphasizing retrofitting commercial and residential buildings, the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) has approved a change to its residential ventilation standard to encourage home retrofits to improve indoor air quality. Addendum e to ANSI/ASHRAE Standard 62.2-2007, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings, allows alternative methods for meeting the standard’s requirements regarding kitchen and bathroom exhaust fans. The standard currently requires fans in those rooms.

An example of an alternative compliance path that is allowed under the addendum would be increasing the overall whole-house ventilation rate to compensate for insufficient or non-existent bathroom exhaust. While the alternative path could result in modest increased energy use due to the extra whole-house ventilation required, the proposal is being made because experience has shown that people doing retrofits will often ignore the standard if the fan requirements are too onerous.

Addendum e can be found here.

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