Vent pipe

Vent pipe

A flue or pipe connecting any interior space in a building with the outer air for purposes of ventilation; any small pipe extending from any of the various plumbing fixtures in a structure to the vent stack.

vent pipe

vent pipe, 2 vent pipe, 1 1. A pipe, attached to drainage pipes near one or more traps, which leads to outside air (e.g., a connection to aVent stack); admits air or takes air away from the drainage pipes and prevents the trap seals from being broken by air pressure within the drainage pipes. 2. A pipe connecting a space on the interior of a building with outside air.