unit vent

dual vent, common vent, unit vent

dual vent
In plumbing, a single vent, 1 connected at the junction of two fixture drains, which serves as a vent for both.
References in periodicals archive ?
Unit vent replacements for Birchwood and Sunnyland Elementary Schools, $203,711 to Bellingham Plumbing & Heating, 3703 Bennett Drive, Bellingham, WA 98225.
Predator(R) Unit Vent w/ Dehumid Controller, VAV w/ Supply Air Temp Response Controller, Predator VAV w/ Variable Speed Fan Controller; Trane, TR1 Series VFD.