Drainage, Waste & VentQuestion 32 of 120
A bathroom group is arranged so that the lavatory drain also serves as the vent for the bathtub downstream of it. What is this arrangement called, and what limits it?
a.A relief vent, limited to one fixture
b.A yoke vent, limited to stacks over 10 stories
c.A wet vent, limited to the fixtures and sizes the code specifically allows
d.A loop vent, limited to island fixtures only
Explanation
A drain that carries waste from one fixture while also serving as the vent for other fixtures is a wet vent, and the code allows it only for the specific fixture combinations and minimum pipe sizes listed for wet venting. A relief vent is a dry vent that connects drain and vent systems, a yoke vent relieves pressure on tall stacks, and a loop vent is the island fixture arrangement.
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