Air Admittance Valves

General Installation Requirements and Approved Uses
1. Install air admittance valves according to manufacturer’s installation instructions and provisions of the IRC.
2. You may use air admittance valves to vent individual vents, branch vents, circuit vents, and stack vents. Use individual and branch type air admittance valves to vent fixtures that are on the same floor level and that are connected to a horizontal branch drain.
3. Use air admittance valves that are rated for the vent size to which the valve is connected.
4. Install air admittance valves within 15