Drainage, Waste & VentQuestion 74 of 360
For a 2 inch trap arm, the maximum developed length to the vent is:
a.3 feet 6 inches
b.5 feet
c.6 feet
d.8 feet
Explanation
A 2 inch trap arm may run a maximum developed length of 5 feet (60 inches) to its vent. The 3 feet 6 inch value is for a 1-1/2 inch arm, 6 feet is for a 3 inch arm, and 8 feet is not a listed value. Exceeding the maximum risks siphoning the trap seal.
Law Reference: 2022 California Plumbing Code (CPC) §1002.2Practice all 360 questions free — no signup required.
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