common 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 ?
To alleviate that concern, the EPA is making revisions that allow testing of a common vent and that clarify that operators do not have to shut a facility for the sole purpose to test a compressor in its non-operating mode, but that the measurement must be made at the next scheduled shutdown.
Their common vent is that Hazare should not consider himself superior to Parliament which alone has the right to debate and decide the Lokpal Bill.
And they did not contain anhydrite, a common vent chimney mineral that dissolves in seawater at temperatures less than about 150[degrees]C (302[degrees]F).