Forum discussion
CS-2009 IEQc5: Indoor Chemical and Pollutant Source Control
Hi All,
I am working on a project with a Full Fresh Air HVAC System i.e. No recirculation, while the toilet ventilation system is full extract to the atmosphere. On this basis, my question is can the filtration required (MERV 13) be relaxed due to the Full Fresh Air System?
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Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
January 9, 2016 - 1:54 pm
Full fresh air systems (also know as DOAS) are common and don't warrant an exemption to the MERV 13 requirement. The goal of the MERV 13 requirement is that you clean the "fresh" outside air before it goes inside. You only have to have a MERV 8 if you were recirculating air.