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ASSE Standard #1050-2009

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Performance Requirements for Stack Air Admittance Valves for Sanitary Drainage Systems - (ANSI Approved: January, 2010)

Stack 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. They 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 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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