Main Vents

Vents in draining systems protects traps against pressure differences that could cause them to siphon or blow out

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Vents protects traps against pressure differences that could cause them to siphon or blow out, leaving occupants unprotected against smell and potential contaminants from the sewer system.

Pipe Size
(in)
DFU max.
(in)
1 1/4 1
1 /1/2 81)
2 24
2 1/2 48
3 84
4 256

1) No water closets permitted

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