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An air admittance valve shall be acceptable as a vent termination for any individual vent, common vent, circuit vent, loop vent and island fixture vent that is provided to prevent siphon-age of a fixture trap. An air admittance valve can be used as an alternative to extending a vent through the roof (or sidewall) to the open atmosphere.
The air admittance valve shall be located a minimum of 4” above the horizontal branch drain or fixture drain being vented. Each valve should be installed in an accessible location.
The valve should be connected to the piping in accordance with the manufacturer’s installation instructions.
The valve should be installed in the vertical, upright position after rough-in and pressure testing of the DWV system.
A minimum of one vent shall extend to the open atmosphere for ever building drainage system. The valve should not be installed as a vent terminal for any special (chemical) waste system or in supply and return air plenums.
For installation in areas with temperature range between –40 and 150 degrees F.
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