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NC-v4 EQc1: Enhanced indoor air quality strategies
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Fan Powered Terminal Unit MERV-13 Filtration
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Afogreen Build
www.afogreenbuild.comGreen Building Consultant
247 thumbs up
December 7, 2020 - 8:38 am
Hi Leslie,
The requirement of MERV-13 is for ventilation system that supplies outdoor air to occupied spaces. If the recirculated air delivered by FPTU does not supply outdoor air to occupied space, then it does not need to be filtered by a MERV-13.
Lawrence Rennell
Rennell Associates, LLC2 thumbs up
July 23, 2021 - 11:48 am
Is there a specific CIR that addresses this? I am working on a project utilizing a VRF system with a dedicated outdoor air unit where this scenario would apply.
Dave Hubka
Practice Leader - SustainabilityEUA
LEEDuser Expert
530 thumbs up
July 23, 2021 - 12:33 pm
I agree with Afogreen Build.
per the credit language: "Each ventilation system that supplies outdoor air to occupied spaces must have..."
recirculated air through a fan powered terminal unit is not a unit that supplies outdoor air, hence it is exluded from this filter requirement. a CIR should not be required.
Karen Joslin
Sustainability LeadPAE Consulting Engineers
5 thumbs up
July 23, 2021 - 12:48 pm
david has this right - the requirement is clear in the credit language. MERV 13 is required where the outside air enters the system and nowhere else.