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FAQs about IEQp1 :

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?

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

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EBOM-2009 IEQp1:Minimum IAQ Performance

IEQp1 compliance for high-rise with 1 outdoor air intake

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Dawn Brenner
Optimized Energy
LEEDuser Basic Member
9 thumbs up

The 1987 high-rise building in California I am attempting LEED certification for has an EnergyStar label and, thus, was signed off by a PE as meeting ASHRAE 62.1/2007. The building has only one outdoor air intake that is 100% open at all times and cannot be modified. The PE established the building met ASHRAE 62.1 by measuring the Outdoor Air (OA) CFM coming into the building at that intake unit. He also measured the outside air CFM into the Air Handlers at three floors of the building - the top floor, a middle floor, and the bottom floor. If these measurements were sufficient for the Energy Star label, are they also sufficient for LEED, or do I need to take measurements at the Air Handlers on every floor? Thank you for any information you can provide.

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David Hubka
Director of Operations
Transwestern Sustainability Services
LEEDuser Basic Member
355 thumbs up

Thu, 06/09/2011 - 14:01

The prerequisite requires applicants to demonstrate that each outside air intake, supply air fan, and/or ventilation distribution system supplies the minimum outdoor air ventilation for each air handling unit. I would expect the LEED reviewer would ask you for OA measurements at every AHU. The LEED online template requires the reading to be taken during the performance period. Hope this helps.
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Dave Madsen
Director of Engineering & Sustainability
Qualis Group LLC
LEEDuser Basic Member
15 thumbs up

Fri, 12/02/2011 - 12:59

Does this mean that for compliance with IEQp1 we will need to demonstrate calculations (from ASHRAE 62.1) that show the required OA rate, AND take measurements at each AHU utilizing the OA proving that we meet the calculated rate? Or would it be sufficient enough to take measurements at only the units supplying OA (i.e. if you have a large MAU that distributes ventilation air to multiple FCU's, do you need to measure OA at each FCU or simply measure the OA supply at the main MAU?)
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David Hubka
Director of Operations
Transwestern Sustainability Services
LEEDuser Basic Member
355 thumbs up

Fri, 12/02/2011 - 15:08

LEED requires OA measurements to be taken at the system level. If you have a large make-up air unit that distributes OA to numerous fan coil units you will need to take OA measurements at each fan coil unit. i.e. the fan coil units are considered to be "the system level".

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