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Compliance through use of filtered recirculated air proposed for ASHRAE residential IAQ standard
By Brianna Crandall, September 28, 2015—A new optional credit for improving filtration combined with ensuring sufficient air flow through filters is being proposed for global building technology society ASHRAE's residential indoor air quality (IAQ) standard.
ANSI/ASHRAE Standard 62.2-2013, Ventilation and Acceptable Indoor Air Quality in Residential Buildings, is said to be the only nationally recognized IAQ standard developed solely for residences of three stories or less.
Standard 62.2 defines the roles of and minimum requirements for mechanical and natural ventilation systems and the building envelope intended to provide acceptable indoor air quality in residential buildings. Eight proposed addenda to Standard 62.2-2013 are currently open for public comment.
Among the proposed addenda is addendum "k", which is open for public comment until October 4, 2015. The addendum would create a compliance path based on the use of recirculated air that has been filtered to reduce exposure in the building interior to particulate matter not exceeding 2.5 microns.
"These particles (PM2.5) have been found to be one of the most important indoor contaminants from a health perspective," said Paul Francisco, 62.2 committee chair. "This change would provide an optional credit for having improved filtration combined with ensuring that sufficient air flowed through the filter. This would be the first time the standard has focused on a specific contaminant."
In addition, addendum "v" is open for public review until October 19. The addendum sets out requirements for non-continuous ventilation. Whereas the standard has included an option for intermittent ventilation, this proposed change provides calculation procedures for a broader range of potential operation schedules.
The addendum also contains a limit on how much contaminants can increase over a short term due to non-continuous operation to ensure this type of operation does not result in periodic excessive contaminant levels, according to Francisco.
Other addenda scheduled for review until October 4, 2015, are:
For more information or to comment on the proposed addenda, visit ASHRAE's Public Review Draft Standards / Online Comment Database.