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 Engineer

Integral Group

LEEDuser Expert

342 thumbs up

Sat, 01/09/2016 - 18:54

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.

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