Drainage, Waste & VentQuestion 93 of 360
For a 1-1/4 inch trap arm, the maximum developed length to the vent is:
a.30 inches
b.42 inches
c.24 inches
d.36 inches
Explanation
A 1-1/4 inch trap arm may run a maximum developed length of 30 inches (2 feet 6 inches) to its vent. The 42 inch value is for a 1-1/2 inch arm. Values of 24 and 36 inches are not the listed maximum for this smallest trap arm size.
Law Reference: 2022 California Plumbing Code (CPC) §1002.2Practice all 360 questions free — no signup required.
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- A horizontal drain run is 80 feet long at 1/4 inch per foot slope. What is the total fall over the run?
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- Over its length, the total fall of a trap arm must not exceed:
- For a 4 inch trap arm, the maximum developed length to the vent is:
- A cleanout is required at:
- A cleanout is required where an aggregate horizontal change of direction in a drainage line exceeds:
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