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FAQs about IEQp1 :

Is outdoor air quality testing required in a space using natural ventilation?

For a space designed to be naturally ventilated, can operable windows or vents be used to satisfy the 62.1-2007 requirements?

What options are available to projects outside the US to meet this prerequisite?

Can LEED 2009 projects elect to follow ASHRAE 62.1-2010 for this prerequisite?

Which units should be included in the calculations for this prerequisite?

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NC-2009 IEQp1:Minimum IAQ Performance

EQ p1 -Minimum IAQ Performance (Natural Ventilation)

Hello, We are working on a Project, in which most of the rooms are complying with the ASHRAE 62.1-2007 Natural Ventilation requirements, stated under the IEQ Prerequisite 1 – Minimum Indoor Air Quality Performance. And there are few rooms which are not qualifying as per the requirement. The Engineer is proposing Exhaust systems in the rooms which are not qualifying following the Natural Ventilation approach. This exhaust system will create a negative pressure in the Non-qualifying room, which will suck the air from the adjacent Qualifying rooms. The queries are as follows: 1. Will installation of the exhaust system help to comply as per the requirement? 2. Can the openings at the bottom of the door be provided to help us qualify the credit? 3. Is there any requirement of CFM for the exhaust systems to comply with the LEED requirement? Do we need to consider the exhaust CFM as per Section 6 of ASHRAE 62.1-2007? Thanking you in advance.

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Roger Chang
Principal, Energy and Engineering Leader
DLR Group | Westlake Reed Leskosky
LEEDuser Expert
267 thumbs up

Mon, 06/30/2014 - 15:29

You may utilize transfer air induced by exhaust fans to comply with ASHRAE 62.1-2007, but the following must be considered: 1) Air class - this is described in the standard. There are 4 classes, with 1 being the cleanest air and 4 being exhaust from contaminated sources, like fume hoods. 2) Ventilation effectiveness - when utilizing transfer air, there is a de-rating factor you need to account for, typically more than 50%. 3) The exhaust airflow rate is dictated within ASHRAE 62.1. Note there is a limit to how much air can be transferred through an undercut door. This is typically limited to residential applications where air volumes are relatively small.

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