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NC-v4 EQp1:Minimum indoor air quality performance

Section 6.4.1.2, crossed ventilation

I don't know how to interpret the following section of ASHRAE 62.1-2010: "6.4.1.2. Double side openings. For spaces with operable openings on two opposite sides of the space, the maximum distance from the operable openings is 5H, where H is the ceiling height" Option 1-the distance between the two walls is 5H, (i.e. the air travels a distance of 5H) Option 2-the ventilated area is 5H from each opposite wall (i.e. the distance between the two walls can be a maximum of 10H) Thank you,

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Ben Stanley
Senior Sustainability Manager
WSP - Built Ecology
LEEDuser Expert
188 thumbs up

Fri, 11/13/2015 - 23:43

Based on the language in 6.4.1.3 I think it means that the maximum distance between the two sides if 5H. I haven't seen this tested on a project though. Would be interested if others have a different opinion.

Fri, 11/13/2015 - 23:49

Thanks Ben, I agree with you. The project is begining construction phase, so I am afraid I will not have an outcome until late next year.

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