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Venting for Plumbing Systems
Jan 01, 2007 · The seal of any fixture trap shall not be subjected to a pneumatic pressure differential of more than 1 inch of water column (249 Pa). 12 inches of water column equals 0.433 psig. 1 inch of water column equals 0.036 psig. This also refers to half of the trap seal which shall be at least two inches. Trap seal With an atmospheric pressure of ...
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