Plumber Red Seal · Question
In a bathroom group, which fixture's trap arm is commonly used as a wet vent for other fixtures on the same floor?
A lavatory drain is frequently used to wet vent other fixtures like a bathtub or shower because it has a low hydraulic load (DFU) and its drain is typically lar
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Question: In a bathroom group, which fixture's trap arm is commonly used as a wet vent for other fixtures on the same floor?
Answer options:
- Water closet
- Bidet ✅ Lavatory
- Kitchen sink
Correct answer: Lavatory
Explanation: A lavatory drain is frequently used to wet vent other fixtures like a bathtub or shower because it has a low hydraulic load (DFU) and its drain is typically larger than required for its own use, providing adequate air for the other fixtures. Kitchen sinks are not permitted to be part of a wet-vented bathroom group due to grease.
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