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Should we install furniture and furnishings before IAQ testing or flushout?

The air temperature and/or relative humidity went out of the credit requirement specifications for a portion of the flush-out. What do we do? Can we extend the flush-out for the equivalent amount of time to make up for it?

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NC-2009 IEQc3.2:Construction IAQ Management Plan—Before Occupancy

Do all units have to run at 100% OA for this credit?

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Saju Varghese
SUSTAINABILITY COORDINATOR
JALRW Eng. Group Inc.
LEEDuser Basic Member
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We have 4 A/C Units providing air conditioning to a building, two of them are 100% OA units and two of them are providing the total air supply cfm (OA + recirulated air) is 7000 cfm and 8600 respectively, including 1100 cfm of OA in each. I was wondering the guide does NOT specifically says that for the flush the equipment needs to provide 100% OA, but instead 14000 cf/sf. even if through the process you are recirculating air. Is this assumption correct? The project is located in Florida, if the equipment provides OA 100% 24hr/day it may humidify the drywall indoors and cause a problem. Thanks

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Thu, 04/17/2014 - 19:19

Victor- the required volume of air (14,000 cubic feet) has to all be "outside air". This does not mean that the system has to deliver 100% OA, but rather, that if the system is delivering a mix of OA and recirculated, you can only count the OA portion toward the total volume.
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Saju Varghese
SUSTAINABILITY COORDINATOR
JALRW Eng. Group Inc.
LEEDuser Basic Member
24 thumbs up

Fri, 04/18/2014 - 14:28

Great, if that is the case we can definitely provide that volume in about 40 days, system running as originally intended. Is there any reference in regards to that I can forward to our engineers for clarification? There is a believe out there that the equipment have to run 100% OA to be considered "flush out". Any reference? Do we need to maintain the min ventilation per sf of 0.3 cfm of option 2?

Fri, 04/18/2014 - 14:38

LEED NC 2.2 used to refer to "100% Outside Air", so that could be where the percepion is coming from. The equivalent credit in LEED 2009 does not refer to a need for 100% outside air anywhere, it just gives a total volume of outside air. It also doesn't specifically say it doesn't have to be 100% OA, though, so I know it's not exactly what you're looking for. We have done flush outs that do not use 100% OA several times and we have not had problems on review.
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Saju Varghese
SUSTAINABILITY COORDINATOR
JALRW Eng. Group Inc.
LEEDuser Basic Member
24 thumbs up

Mon, 04/21/2014 - 21:40

Thanks for your reply Allison, really helpful

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