NM CID MM-1 Practice Questions - New Mexico CID MM-1 Plumbing Examination Exam

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A house isometric shows three private 1.6 gpf water closets, three lavatories, two bathtubs, one kitchen sink, and one clothes-washer standpipe on a single 3 inch building drain. What is the DFU total, and is the 3 inch drain acceptable?

21 DFU, but no — any building drain with a water closet must be 4 inches 21 DFU, and yes — 21 DFU is under 35 DFU and three closets are under the five-closet cap 27 DFU, so the drain must be 4 inches 14 DFU, so a 2 inch building drain is adequate

Correct Answer:

21 DFU, and yes — 21 DFU is under 35 DFU and three closets are under the five-closet cap

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