Our project, as with most projects, has various air handling units with different OSA rates. To achieve the 14,000 cuft / sf, do we calculate the building as whole, or does each space have to achieve 14,000 cuft / sf from the unit serving that area? We have a couple rooms with small split systems and these spaces would take over 60 days under the 'before occupancy' flush-out, but if counted in aggregate, then the flush-out would only take 9 days. Please advise. Thanks.
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Allison Beer McKenzie
Architect, Director of SustainabilitySHP Leading Design
LEEDuser Expert
646 thumbs up
December 29, 2010 - 11:46 am
Tyler- I don't have access to my reference guide at the moment to check the exact language, but the intent of the credit is certainly to provide 14,000 cubic feet for each individual square foot of space, not an aggregate. Depending on how your systems are set up, though, you may be able to use an adjacent system to supplement the area that would have a long flush out time.
Patrick Farmer
LEED Project ManagerDrew George & Parnters, Inc
19 thumbs up
December 29, 2010 - 12:50 pm
Thanks Allison. I agree with you that the it makes sense to count the building on a space by space basis, but there is no indication that this is how the credit is calculated in the reference guide. Furthermore, the equations and calculations that are provided are based on the building in aggregate. We are planning on supplementing our smaller systems with temporary fans and any other strategies to achieve this on a space by space basis, but it appears this level of detail was not addressed in this version of the reference guide. Thanks.