How do you size an air admittance valve?

How do you size an air admittance valve?

AAVs are typically available with 1 ½”, 2”, 3” and 4” adapter connections. The adapter size is based on the diameter of the vent pipe it is being installed on. Generally, a vent should be sized to be half the pipe diameter of the drain it is serving (refer to local codes for specific vent size recommendations).

Do air admittance valves meet code?

Now, AAVs are accepted by virtually all national building codes, including the SBCCI, BOCA, IRC, and IPC plumbing codes. Under the IPC, AAVs are listed for installation under Section 917; west of the Mississippi River, they’re covered under Section 301.2 of the UPC.

How high should a air admittance valve be?

Individual and branch-type air admittance valves shall be located a minimum of 4 inches (102 mm) above the horizontal branch drain or fixture drain being vented. Stack-type air admittance valves shall be located not less than 6 inches (152 mm) above the flood level rim of the highest fixture being vented.

What is the British standard for air admittance valves?

BS EN 12056-2 details the requirements for the use of air admittance valves in gravity drainage systems installed inside buildings, with particular reference to positioning and dimensions of the proposed valve as part of the chosen drainage ventilation configuration.

Why are AAV not allowed?

Because an AAV requires negative pressure to open, it cannot be installed to vent a sump pump, which generates positive air pressure when operating. Also, a home’s plumbing drainage cannot rely entirely on AAVs; a minimum of one vent through the roof is required by the building code.

Can an air admittance valve be used to vent a toilet?

Since you want to install it to vent the toilet, the best solution is to attach the system to the toilet drain. Keep in mind that you need to install Air Admittance Valve at least 4 inches (10 cm) higher than a drain line.

Can you use a wye vertically?

Ans: Wye is only used for going from the horizontal to the vertical plane. If you use them horizontally, they will be exposed to clogging.

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