Red Seal Plumbing Practice Exam

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Where should an additional circuit vent be connected in a branch serving eleven water closets (WC's)?

Between the first and second WC's
Between the fifth and sixth most upstream WC's
At the end of the branch
Between the most downstream WC and the relief vent

The correct answer is: Between the fifth and sixth most upstream WC's

An additional circuit vent should be connected between the fifth and sixth most upstream WC's. This is because the first and second WC's are too close to each other and connecting a vent there would not adequately relieve pressure, leading to potential clogs or backups. Connecting the vent at the end of the branch would also not be effective, as it would not adequately serve the previous WC's. The most downstream WC and relief vent option is not ideal either, as it would only serve the last WC and not the others in the branch. Therefore, connecting the additional circuit vent between the fifth and sixth WC's would best ensure proper venting for all eleven WC's in the branch.