Drainage, Waste & VentQuestion 112 of 360
An island sink, with no wall to run a vent up, is commonly vented using a:
a.Circuit vent
b.Relief vent only
c.Common vent
d.Island (loop) vent
Explanation
An island sink is typically served by an island or loop vent, which rises as high as possible under the countertop, loops back down, and connects to the vent system to allow venting where no wall is available. A circuit vent serves a battery of fixtures, a relief vent supplements a stack, and a common vent joins only two fixtures at the same level.
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