What is the primary purpose of a plumbing vent system?

To protect trap seals by equalizing air pressure within the drainage system, preventing siphonage and back pressure, and allowing sewer gases to escape safely to the atmosphere.

What is an individual vent (back vent)?

A vent pipe that connects to the drain pipe of a single fixture and extends to the main vent stack or open air, protecting only that fixture's trap.

What is a common vent?

A single vent pipe that serves two fixture drains installed at the same level on opposite sides of a wall, connecting them at the junction of their drain pipes.

A pipe that serves simultaneously as both a vent and a drain for one or more fixtures, typically used in bathroom groups to reduce the number of vent pipes required.

What is a circuit vent?

A branch vent that serves two or more traps on a horizontal branch drain, connected at the most downstream fixture and running upward to the vent stack.

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Venting Systems – Plumber Journeyman Exam

Master venting systems for the Plumber Journeyman Exam with 27 targeted flashcards covering vent types, sizing, installation requirements, and code applications. Topics include individual vents, circuit venting, wet venting, air admittance valves, and trap-to-vent distances to ensure exam-ready knowledge.

27 cards Intermediate Vent Types & Definitions Sizing & Distances Installation Requirements Code Applications & Special Scenarios

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