Plumber Red Seal · Question
Which of the following is an acceptable use for an Air Admittance Valve (AAV) under the NPC?
AAVs are one-way valves that allow air to enter the DWV system to relieve negative pressure but do not allow sewer gas to escape. They are permitted for specifi
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Question: Which of the following is an acceptable use for an Air Admittance Valve (AAV) under the NPC?
Answer options:
- To serve as the primary vent for a whole building.
- In a location subject to positive drainage system pressure.
- As a replacement for a vent stack. ✅ To vent a remote fixture or group of fixtures where a conventional vent is impractical.
Correct answer: To vent a remote fixture or group of fixtures where a conventional vent is impractical.
Explanation: AAVs are one-way valves that allow air to enter the DWV system to relieve negative pressure but do not allow sewer gas to escape. They are permitted for specific applications, like island sinks or remodels, but not as a replacement for the main vent stack which must relieve positive pressure.
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