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FAQs about IEQp1 :

We have a VAV system where single AHUs serve multiple zones. Do we need to take outside air measurements at each VAV box?

What if after our Preliminary Review we have to re-work the ventilation rate procedure calculations and find that we need to make corrections to the system in order to meet the prerequisite? Can we redo the outside air testing after making corrections? Wo

What if our systems do not meet the required outside air when systems are tested at worst-case conditions?

Our building has a single fan that supplies outside air to multiple AHU’s. Do we need to perform outside air testing at the supply fan or at all AHUs?

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EBOM-2009 IEQp1:Minimum IAQ Performance

Physical constraints

Hallo, I am wondering what is the Reference Guide referring to when it says "physical constraints of the existing ventilation system". For instance, should I consider a "physical constraint" a space that wasn't designed with ventilation and additional ductwork is needed from the AHU to provide outdoor air?

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Ben Stanley
Senior Sustainability Manager
WSP - Built Ecology
LEEDuser Expert
188 thumbs up

Thu, 03/03/2016 - 22:36

Hi Gustavo, you've been working through some tricky situations! I guess the first thing is that the project would be required to make some adjustment or installation to provide ventilation to the previously unventilated space in order to meet the prerequisite. Then, in my experience, GBCI may require the project to supply ventilation to that space to meet ASHRAE 62.1 levels, rather than Case 2, despite the fact that the space was previously unventilated. But there's a caveat to that. If there are physical constraints associated with the building that made it impossible to supply the ASHRAE 62.1 airflow, like something that would restrict the size of the ductwork, I believe that GBCI would allow the space to just meet Case 2 (10 cfm/person). This may be a good situation to submit a CIR to confirm with GBCI.

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