air admittance valve installation height
2 Engineered Products Manual Air Admittance Valves (AAVs) are devices that were created to solve problems with the open pipe venting systems and can serve as a vent for Drainage Waste and Vent (DWV) systems in lieu of open pipe vents.he air admittance valve shall be located within the maximum developed length permitted for the vent. The air admittance valve shall be installed not less than 6 inches (152 mm) above insulation materials.