Hi everyone, our engineer has a question about calculating the average pascal. His exact questions is: "...but I do not know what they are looking for with the “Average Pressure Differential”. I have found an equation to use which I feel is for the minimum, but I have not been able to find anywhere anything that says what LEED is looking for with the average." If it helps, here is the information he has filled in on the LEED template for one room. Room Area = 99 sf Exhaust Rate = 1.5 cfm/sf Minimum Pressure Differential = 3.3pa Any guidance is greatly appreciated! Thanks

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Dylan Connelly

Mechanical Engineer

Integral Group

LEEDuser Expert

342 thumbs up

Sat, 01/25/2014 - 02:15

If you are continuously exhausting the space during occupied hours - your average and minimum are the same.

Elise LaPaglia

Intern Architect

HKS, Inc.

LEEDuser Basic Member

1 thumbs up

Tue, 09/16/2014 - 16:49

So your minimum is 3.3pa, and according to Dylan's guidance it will be the same as your average. If your average is only 3.3pa, how does it comply? Doesn't the average have to be at least 5pa? I am working on a project with our janitor's closets being only 22s.f. The doors are standard with 1/8" gaps around the top and sides and a 1/4" gap on the bottom. Because of the small size of the closet, our average pressure differential is only getting to 1.1pa. Our Mech. engineer is confident we meet the intent of the credit but we do not meet the LEED blanket requirement. Would appreciate if anyone can provide swift guidance!

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