positive and negative pressure percent

[nightmareyan]

hi everyone,
I would like to know the max tolerate percent of different between positive and negative pressure in building.Sometime we need to extract some air flow if there are too much positive. Sometime negative.But i don't know exactly when we need to add and extract air flow by seeing different of intake and exhaust.
Does somebody know this problem!

 

[DRWeig]

Use a pressure sensor. Keep positive about 0.05" H20. Any more and your doors won't shut or will exceed the opening force needed by handicap code.

Best to you,

Goober Dave

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