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FAQs about IEQc3.2 :

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

Flushout calcs for Option 1 Path 1

To achieve the required time needed for flush out, do we only take into consideration the OA louver volume (CFM)? So if we have a total flush volume of 15,000,000 and the OA louver has a CFM volume of 250 then our flush out time would be 41.7 days. Is this correct? I would think we would have missed some variables by doing that.

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armando chamorro
CIH, LEED AP, CBCP
CIH Environmental Solutions
LEEDuser Basic Member
3 thumbs up

Tue, 05/08/2012 - 09:23

Mark Are you sure there is only 250 cfm of outside air coming into the HVAC? The flow seems to be too small unless the building is also very small. What are the dimensions of the areas to be flushed out?
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Dylan Connelly
Mechanical Engineer
Integral Group
LEEDuser Expert
342 thumbs up

Tue, 05/08/2012 - 15:47

15,000,000 CF of Air / 14,000 CFM/SF = 1071 SF. Hopefully your HVAC unit is capable of Economizer. In which case, the unit may have a minimum OA of 250 CFM but a maximum OA of 100% of the total SA. If the unit doesn't have economizer capabilities. Consider bringing in a temporary fan/conditioning unit that can bring in OA (make sure you stay within the temperature and humidity requirements) to reduce the flush out time. Or if you have operable windows open the windows while flushing and go with the testing method.

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