Plumber Red Seal · Question
A 3-inch horizontal drainage pipe serves 3 water closets and 4 lavatories. Using a wet venting system, what is the minimum size of the wet vent portion?
In a wet venting system, the wet vent must be sized based on the total fixture unit load connected to it and must be at least one size larger than the minimum r
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Question: A 3-inch horizontal drainage pipe serves 3 water closets and 4 lavatories. Using a wet venting system, what is the minimum size of the wet vent portion?
Answer options:
- 2 inches
- 2.5 inches ✅ 3 inches
- 4 inches
Correct answer: 3 inches
Explanation: In a wet venting system, the wet vent must be sized based on the total fixture unit load connected to it and must be at least one size larger than the minimum required vent, but never smaller than the drain it serves. In this multi-bathroom group, a 3-inch wet vent is typically required.
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