Plumber Red Seal · Question
A plumber is installing a gang of three lavatories in a public washroom. Which of the following venting methods is typically permitted by the NPC for this configuration?
For a gang of fixtures like multiple lavatories discharging into a horizontal branch drain, a circuit vent is a common and permitted method by the NPC. It vents
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Question: A plumber is installing a gang of three lavatories in a public washroom. Which of the following venting methods is typically permitted by the NPC for this configuration?
Answer options:
- Common vent ✅ Circuit vent
- Relief vent
- Island vent
Correct answer: Circuit vent
Explanation: For a gang of fixtures like multiple lavatories discharging into a horizontal branch drain, a circuit vent is a common and permitted method by the NPC. It vents multiple traps through a single vent pipe connection. A common vent is for two fixtures only, a relief vent is used in conjunction with a circuit or loop vent, and an island vent is specifically for fixtures not adjacent to a wall.
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