Red Seal Plumbing Practice Exam

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What is the minimum size of a plumbing vent serving a typical basement three piece plumbing rough-in with a developed length of 12 meters?

  1. 1" continuous vent

  2. 1 1/2" continuous vent

  3. 2" continuous vent

  4. 3/4" continuous vent

The correct answer is: 1 1/2" continuous vent

The minimum size of a plumbing vent serving a typical basement three piece plumbing rough-in with a developed length of 12 meters is 1 1/2 inches. This is because the minimum size requirement for a vent is based on the fixture drain it serves, and a basement three piece plumbing rough-in typically includes a toilet, sink, and shower/tub which all have a drain size of 1 1/2 inches. Option A, 1 inch continuous vent, is too small and may cause clogs in the vent, leading to drainage issues. Option C, 2 inch continuous vent, is larger than the required size and may not fit in the limited space of a basement. Option D, 3/4 inch continuous vent, is also too small and may not provide adequate ventilation for the plumbing system. Therefore, option B is the most appropriate and correct answer for this question

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