Plumber Red Seal · Question
What is the maximum allowable horizontal distance between a P-trap and its protecting vent for a 1.5-inch fixture drain?
According to the NPC, the maximum trap-to-vent distance is based on pipe size to prevent self-siphonage. For a 1.5-inch pipe, this distance is 1.8 meters (6 fee
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Question: What is the maximum allowable horizontal distance between a P-trap and its protecting vent for a 1.5-inch fixture drain?
Answer options:
- 1.2 m (4 ft) ✅ 1.8 m (6 ft)
- 2.4 m (8 ft)
- 3.0 m (10 ft)
Correct answer: 1.8 m (6 ft)
Explanation: According to the NPC, the maximum trap-to-vent distance is based on pipe size to prevent self-siphonage. For a 1.5-inch pipe, this distance is 1.8 meters (6 feet).
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