Which vent serves two or more fixtures on the same level?

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Study for the NOCTI Plumbing Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Ensure your success on the exam!

Multiple Choice

Which vent serves two or more fixtures on the same level?

Explanation:
A common vent is designed to serve two or more fixtures on the same level. It collects the vent lines from those fixtures and lets air enter the drainage system through a single vent, which prevents negative pressure and trap siphoning while simplifying the plumbing layout. This arrangement is efficient for fixtures that are on the same floor and within venting distance. In contrast, a single-fixture vent serves only one fixture, a riser vent runs vertically through the building, and a back vent vents a single fixture from behind or above the trap rather than serving multiple fixtures.

A common vent is designed to serve two or more fixtures on the same level. It collects the vent lines from those fixtures and lets air enter the drainage system through a single vent, which prevents negative pressure and trap siphoning while simplifying the plumbing layout. This arrangement is efficient for fixtures that are on the same floor and within venting distance. In contrast, a single-fixture vent serves only one fixture, a riser vent runs vertically through the building, and a back vent vents a single fixture from behind or above the trap rather than serving multiple fixtures.

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