Sheet metal & Air Conditioning Contractors’ National Association

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ASHRAE's new residential IAQ guideline advises using high efficiency filters

Recent research shows that ultrafine particles are more hazardous to human health than originally thought. ASHRAE’s newly published 2015 version of the residential indoor air quality (IAQ) guideline suggests higher-efficiency filters should be used.

The ASHRAE Guideline 24-2015, Ventilation and Indoor Air Quality in Low-Rise Residential Buildings, provides information on achieving good IAQ that goes beyond the requirements in Standard 62.2, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings.

It provides explanatory and educational material not included in the code-intended standard. Guideline 24 is the companion document to Standard 62.2.

“In the 2008 version, we indicated that if a lot of ultrafine particles were expected, higher-efficiency filters should be considered. Period,” Paul Francisco, chair of the Guideline 62.2 committee, said. “Now we say a lot more. We cite research that shows that ultrafine particles are a much more significant concern, and we state explicitly that higher-efficiency filters mean MERV 13 or higher.”

SMACNA’s Residential Contractors Council Steering Committee agreed that the ASHRAE guidelines present opportunities for contractors when particulate types and sizes are mentioned as potential IAQ problems resulting in evaluations of HVAC systems by customers.

Read the press release on this and other changes to Guideline 24 in the ASHRAE newsroom.

Order Guideline 24-2015, Ventilation and Indoor Air Quality in Low-Rise Residential Buildings, in the ASHRAE bookstore.