Building Trap A trap installed in the building drain to prevent air from

15.Building Trap 17.Combined Fixture A combination kitchen and laundry sink in a single unit, with both deep and shallow bowls side by side. An institutional or prison fixture. 18.Combined Building Sewer A combined building sewer is a type of drain system that uses a single drain system to carry water drainage and sanitary waste away from a building. This type of sewer design is no longer used in building new communities (because current design separates sanitary sewers from runoff), but many older cities continue to operate combined sewers. 19.Common Vent Building drain system vertical vent which connects two or more fixture branches on the same level. Dual vent, common vent, unit vent. In plumbing, a single vent, 1 connected at the junction of two fixture drains, which serves as a vent for both. 20.Continuous Vent A continuous vent is a vent which extends from a vertical soil or waste pipe and can serve one or multiple fixtures located on the same story. Continuous vents, like all plumbing vents, protect the trap seal(s) of the fixtures they serve. 21.Continuous Waste A drain from two or more plumbing fixtures connected to a single trap. There are two types of continuous waste: plastic and brass.