Drainage, Waste & VentQuestion 68 of 360
A 4 inch building drain sloped at 1/4 inch per foot is permitted a maximum load of how many drainage fixture units (DFU)?
a.180 DFU
b.250 DFU
c.160 DFU
d.216 DFU
Explanation
Table 703.2 permits a 4 inch building drain or sewer at 1/4 inch per foot to carry a maximum of 216 DFU. At 1/8 inch per foot the same pipe is limited to 180 DFU. The 250 and 160 values do not correspond to a 4 inch drain at this slope.
Law Reference: 2022 California Plumbing Code (CPC) §703.0 (Table 703.2)Practice all 360 questions free — no signup required.
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