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NC-2009 IEQp1:Minimum IAQ Performance

Ductless air system

Hello, I am working on a residential building, the venilation system consists of 4 AHUs that supply air to corridors. The corridors are pressurized and therefore push the fresh air through grills in the ceiling to the apartments. There is no ducting between the corridors and the apartments. Therefore the air transfers through the plenum basically. There is sufficient air flow, but would the system be approved by USGBC ?

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Tue, 06/10/2014 - 12:35

I have worked on a similar design. The only way that I could be sure to get approval was to have an exhaust fan that draws the ventilation air into the living spaces. You have to use a ventilation effectiveness of 0.5. If you are simply counting on a pressurized corridor leaking ventilation air into each space at a uniform rate, it will probably not be approved by the LEED reviewer.

Tue, 06/10/2014 - 12:59

Thanks Andrew for the reply. Originally, we submitted a CIR with this system asking if it is going to be feasible, and the USGBC replied it would be approved. However, in our CIR we added that there will be transfer ducts between the corridor and the apartment, but the project cannot include those ducts due to the fire system in the building. We are trying to find a different approach to solve the issue. Natural ventilation did not work either (small windows).

Fri, 05/22/2015 - 19:49

Were you able to solve your issue?
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Judhajit Chakraborty
Building Performance Specialist
WSP Built Ecology
LEEDuser Basic Member
2 thumbs up

Thu, 01/28/2016 - 18:06

I have a similar case, only difference is, instead of plenum, we are depending on door undercuts and pressure created by bathroom exhaust and dryer exhaust. Please let me know if you were able to resolve your issue. Thanks.

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