Drainage, Waste & VentQuestion 69 of 360
A 3 inch building sewer sloped at 1/8 inch per foot is limited to a maximum of how many DFU?
a.20 DFU
b.27 DFU
c.36 DFU
d.42 DFU
Explanation
Table 703.2 limits a 3 inch building sewer at 1/8 inch per foot to 20 DFU. At 1/4 inch per foot the 3 inch line rises to 27 DFU, and at 1/2 inch per foot to 36 DFU. A 3 inch line also may not receive more than two water closets regardless of DFU count.
Law Reference: 2022 California Plumbing Code (CPC) §703.0 (Table 703.2)Practice all 360 questions free — no signup required.
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