The ABC's of Plumbing - Vent Pipes

In order for wastewater to exit the home air must be able to fill the vacuum left behind by the escaping water. A vent pipe serves this purpose by extending from drainpipes out through the roof of the house. All plumbing fixtures must be connected to the main vent pipe through a vent pipe that spans across to the main vent stack that exits through the roof. In some cases, usually with basement plumbing, the vent may exit out of a side wall if allowed by local building codes.

Vent Stack Obstructions

If you hear gurgling sounds when you flush a toilet or turn on a faucet the vent pipe may be obstructed and in need of clearing. It could also be a sign that the plumbing system is not designed properly and needs a new vent line. Another symptom of obstructed or insufficient venting is plumbing odors, as vent pipes also allow fumes to exit through the airway behind the draining water. In either case, a plumber should inspect the vent pipes to ensure they are working properly.

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 Also check: The ABC's of Plumbing: Video Sewer Line Inspection