The circuit vent connects to which stack?

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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

The circuit vent connects to which stack?

Explanation:
A circuit vent is used to vent a group of fixtures by tying into the building’s vertical vent system. That vertical vent path, the vent stack, carries air into the drainage system and lets sewer gases escape to the outdoors, preventing traps from being siphoned and helping waste water flow smoothly. So, the circuit vent connects to the vent stack. The soil, waste, and drain stacks carry waste or wastewater, not venting air, so they aren’t the right place for a circuit vent to connect.

A circuit vent is used to vent a group of fixtures by tying into the building’s vertical vent system. That vertical vent path, the vent stack, carries air into the drainage system and lets sewer gases escape to the outdoors, preventing traps from being siphoned and helping waste water flow smoothly. So, the circuit vent connects to the vent stack. The soil, waste, and drain stacks carry waste or wastewater, not venting air, so they aren’t the right place for a circuit vent to connect.

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