NCIDQ IDPX Practice Exam 2025 – Complete Interior Design Test Prep

Question: 1 / 400

Which function is NOT a purpose of a plumbing vent?

Prevent siphoning

Prevent backflow

The purpose of a plumbing vent is primarily to provide proper air circulation within the plumbing system. One of the essential functions is to allow for the equalization of pressure, which helps to prevent siphoning – a condition where water is drawn out of traps and can lead to sewer gases entering the building. Additionally, plumbing vents help to eliminate toxic gases from the drainage system by allowing them to escape outside rather than being trapped in the plumbing fixtures.

Backflow, on the other hand, is a different phenomenon involving the reverse flow of water or other substances into the drinking water supply and is primarily addressed through mechanisms like backflow preventers, check valves, and other regulatory measures, rather than venting systems. Thus, preventing backflow is not a function of a plumbing vent, making it the correct answer in this context.

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Equalize pressure

Eliminate toxic gases

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