confluent vent

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1. A pipe installed to provide a flow of air to or from a drainage system or to provide a circulation of air within such system to protect trap seals from siphonage and back pressure.
2. A Vent connector.
3. A Vent system.
4. AVentilator, 3.
5. A stack designed to allow moisture vapor or other gas from inside a building or building system to escape into the atmosphere.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.