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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

Subtracting built-in furniture/casework from square footage

We've had a designer tell us that built-in furniture and case work (like a fan-coil unit enclosure) can be deducted from the square footage of a room when calculating the window opening requirement. ASHRAE 62.1 says "Naturally ventilated spaces shall be permanently open to and within 8 m (25 ft) of operable wall or roof openings to the outdoors, the openable area of which is a minimum of 4% of the net occupiable floor area." Do others agree that the square footage of those items can be deducted? This is for a residence hall application. Thanks.

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Julia Weatherby
President
Weatherby Design & Co. Engineers
LEEDuser Basic Member
67 thumbs up

Thu, 01/23/2014 - 21:28

Yes I agree that built-in features which reduce the open floor area can be deducted from the room area when finding net area for natural ventilation calculations. - Julia Weatherby PE, LEED AP BD+C

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