Plumber Red Seal · Question
According to the NPC, what is the maximum number of water closets that are permitted to connect to a single circuit-vented horizontal branch?
The National Plumbing Code allows a maximum of 8 fixtures (excluding floor drains), such as water closets, to be served by a single circuit vent, provided all o
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Question: According to the NPC, what is the maximum number of water closets that are permitted to connect to a single circuit-vented horizontal branch?
Answer options:
- 2
- 4
- 6 ✅ 8
Correct answer: 8
Explanation: The National Plumbing Code allows a maximum of 8 fixtures (excluding floor drains), such as water closets, to be served by a single circuit vent, provided all other sizing and installation requirements for the branch and vent are met.
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