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NC-v4 EQc1:Enhanced indoor air quality strategies

Fan Powered Terminal Unit MERV-13 Filtration

Is the recirculated air delivered by a Fan Powered Terminal Unit required to be filtered by a MERV-13 filter at the Fan Powered Terminal Unit? All outside air delivered to the air handling unit is already filtered by a MERV-13 filter at the air handling unit itself before being ducted to the FPTU.

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Afogreen Build
www.afogreenbuild.com
Green Building Consultant
LEEDuser Premium Member
249 thumbs up

Mon, 12/07/2020 - 13:38

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.

Fri, 07/23/2021 - 15:48

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.
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Dave Hubka
Practice Leader - Sustainability
EUA
LEEDuser Expert
510 thumbs up

Fri, 07/23/2021 - 16:33

 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.
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Karen Joslin
Sustainability Lead
PAE Consulting Engineers
LEEDuser Basic Member
5 thumbs up

Fri, 07/23/2021 - 16:48

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.

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