A plumbing inspector has identified that a proposed plumbing system design includes an unvented loop for a floor drain, which is prohibited by the National Plumbing Code of Canada. The system needs to be redesigned to incorporate proper venting for the floor drain. Which of the following venting methods would be an acceptable solution to properly vent the floor drain according to code?

Question: A plumbing inspector has identified that a proposed plumbing system design includes an unvented loop for a floor drain, which is prohibited by the National Plumbing Code of Canada. The system needs to be redesigned to incorporate proper venting for the floor drain. Which of the following venting methods would be an acceptable solution to properly vent the floor drain according to code?

Answer options: ✅ Individual vent extending through the roof.

• Circuit vent connected to a battery of other floor drains.
• Wet vent with other fixtures draining into it.
• Relief vent serving a stack that the floor drain ties into.

Correct answer: Individual vent extending through the roof.

Explanation: An individual vent extending through the roof directly vents the trap of the floor drain, providing proper atmospheric pressure to prevent trap seal loss. While circuit venting, wet venting, and relief venting are acceptable methods for specific configurations, an unvented loop for a floor drain is not allowed, emphasizing the need for direct or approved indirect venting for trap protection. The individual vent is the most direct and universally acceptable solution for a single floor drain.