AZ ROC R-37R Plumbing Practice Questions - Arizona ROC R-37R Plumbing (Residential) Examination Exam

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A branch drain serves 2 water closets (3 DFUs each), 2 lavatories (1 DFU each), and 1 kitchen sink (2 DFUs). What total DFU load does this branch carry, and what minimum pipe size is required?

8 DFUs, requiring a 2-inch pipe 10 DFUs, requiring a 3-inch pipe 10 DFUs, requiring a 2-inch pipe 12 DFUs, requiring a 4-inch pipe

Correct Answer:

10 DFUs, requiring a 3-inch pipe

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