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ASHRAE Releases New Residential IAQ Guideline

Last month ASHRAE released Guideline 24-2015 “Ventilation and Indoor Air Quality in Low-Rise Residential Buildings,” which contains changes regarding the use of high-efficiency filters. The new ruling recommends that higher-efficiency (MERV 13 and higher) filters should be considered. Multi-stage particle filtration can help filter out different sized particles without overloading the higher-efficiency filters. When selecting filters, consideration should be given to the effects of the filter’s pressure drop on delivering air flow, fan capacity and energy use, according to the new guideline.

The 2015 version of ASHRAE’s residential indoor quality guideline also includes new definitions that align with Standard 62.2, and approximately 20 references were added. All previous references were vetted to make room for the updates. Section 10 “Mechanical Ventilation Systems Design” includes significant updates and expansion. A new subsection now includes range hoods and the related discussion of the new metric, capture efficiency.

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