AAVs cannot be permanently covered and should be installed in an area that allows air to enter the valve. It must be located a minimum of 4” above the horizontal branch drain, 6” above any insulation material and within 15 degrees of vertical.
#DURGO AIR ADMITTANCE VALVE PROBLEMS PATCH#
The negative pressure-activated, one-way vents to protect the trap seals in the drainage system by allowing the intake of air, so that the right level of. Hi all Our externally vented ‘traditional’ stack vent (through the roof) kept leaking through the roof with rain water so to solve the issue for good we cut off the stack pipe in the loft and fitted an air admittance valve and got a roofer to patch the roof in late April. A few years ago we had a durgo valve fitted in our family bathroom (built in next to the sink unit and boxed in) to free up the space taken by the original vent pipe. AAV locationĪn AAV should be located within the maximum developed length permitted for the vent. world leading air admittance valves Studor AAVs eliminate the need for passive pipe venting and costly roof penetrations with world leading performance by their unique and patented design. Air admittance valves do not need any maintenance but can cause problems if they become faulty as they may allow sewer gas into the building. In other words, AAVs with PVC adapters should only be paired with PVC pipe, and AAVs with ABS adapters with ABS pipe. 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).Īdditionally, you should verify what type of pipe material you will be connecting the AAV adapter to ensure compatibility. The adapter size is based on the diameter of the vent pipe it is being installed on. Proper AAV sizing is critical because under-sizing will not allow the plumbing system to operate properly.ĪAVs are typically available with 1 ½”, 2”, 3” and 4” adapter connections. To ensure proper breathing capability, determine all fixtures to be vented and calculate the total DFU load, then select the appropriate AAV for the application. Common fixture load ratings are shown in the table below.
The higher the DFU rating on the valve, the greater amount of air that can enter the Drain-Waste-Vent (DWV) system.ĭFU loads are assigned to plumbing fixtures dependent on the volume rate of discharge, the duration of operation and the time between operations. An AAV’s ability to breathe is measured in DFUs.
You can determine which size AAV you’ll need based on the Drainage Fixture Unit (DFU) load of the fixture(s), such as an island sink or bathroom group, it will vent. If the use of an AAV is not permitted, the fixture or drainage system will have to be vented traditionally through the home’s existing venting system.
#DURGO AIR ADMITTANCE VALVE PROBLEMS CODE#
Key Considerations Local Code and Manufacturer Requirementsīefore heading to your local hardware store, be sure to check with local municipality codes and manufacturer requirements to determine if an AAV is approved for your particular application.
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