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ASSE Standard #1050-2021

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ASSE 1050-2021
Performance Requirements for Stack Air Admittance Valves for Sanitary Drainage

ANSI Approved: July 2021

Stack Air Admittance Valves (AAVs) for Sanitary Drainage Systems are devices used in plumbing drainage systems to prevent the siphonage of water trap seals. These devices do not relieve back pressure; they only allow air to enter the system. These devices are designed to be installed on stacks where branches on multiple floors are connected. When these devices are installed in a building, there shall be at least one (1) open vent terminal to relieve positive pressure which extends to the atmosphere outside of the building serving the building drain on which these devices are installed.

A downloadable version of this standard is also available.

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