Drainage, Waste & VentQuestion 81 of 360
Crown venting, where the vent connects at the top of the trap crown, is:
a.Prohibited; the vent connection must be at least two pipe diameters from the trap weir
b.Required on all P-traps
c.Allowed on 2 inch traps only
d.Required for floor sinks
Explanation
Crown venting is prohibited because the vent opening at the crown quickly clogs with grease and debris. The vent must connect to the trap arm at a point at least two pipe diameters downstream of the trap weir. It is not required or allowed on any specific fixture as a crown vent.
Law Reference: 2022 California Plumbing Code (CPC) §905.0Practice all 360 questions free — no signup required.
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