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air admittance vent

From Wiktionary, the free dictionary

English

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Noun

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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

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