air admittance vent

English

Noun

air admittance vent (plural air admittance vents)

1. (plumbing) a mechanical sewer vent that allows air to enter into the sewage system but does not allow exhaust of sewer gases, to aid the flow of sewage by providing air behind water, where a standard vent stack to atmosphere is not possible, by drawing in interior air but keeping harmful sewer gases contained.

Synonyms

• AAV (abbreviation)
• mechanical vent
• mechanical waste vent
• mechanical sewer vent