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How Big Does A Vent Pipe Have To Be. Vent stacks in a household plumbing system work the same way. The vent pipes have to be above the fixtures so the vent pipes wont fill with water.
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You can connect the kitchen vent to the main vent in the attic as long as the main vent is the proper size and extends through the roof. The sewer gases escaping from the vents smell. A secondary stack perhaps 2 or 3 inches in diameter serves a branch of the system.
Proper Venting Prevents Backdrafting.
Just as drain sizes get bigger as you go further downstream so do vent pipes. The required vent shall be a dry vent that connects to the building drain or an extension of a drain that connects to the building drain. Anything larger including a toilet requires a 15 -inch vent. While many stove pipe and direct vent pipe systems use 90-degree and 45-degree elbows Class A chimney pipe systems do not allow for more than a 30-degree elbow.
