Plumber Red Seal · Question
According to the National Plumbing Code (NPC), when may an air admittance valve be used to vent a fixture?
Air admittance valves (AAVs) are generally restricted and permitted by the NPC primarily for island sinks or in situations where extending a vent to the outdoor
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Question: According to the National Plumbing Code (NPC), when may an air admittance valve be used to vent a fixture?
Answer options: ✅ Only when connecting to an existing system where a traditional vent is not possible.
- On any new construction fixture group as a primary vent.
- In a location that is subject to freezing temperatures.
- To vent sump pits or Macerating toilet systems.
Correct answer: Only when connecting to an existing system where a traditional vent is not possible.
Explanation: Air admittance valves (AAVs) are generally restricted and permitted by the NPC primarily for island sinks or in situations where extending a vent to the outdoors is structurally impractical, especially in renovations.
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