Plumber Red Seal · Question
A residential bathroom contains a water closet, a lavatory, and a shower. According to the National Plumbing Code of Canada, what is the minimum total fixture unit value for calculating the drainage piping size for this bathroom?
According to the NPC Table 2.4.9.3.(1), a water closet (private use) has a drainage fixture unit (DFU) value of 3, a lavatory has a DFU of 2, and a shower has a
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Question: A residential bathroom contains a water closet, a lavatory, and a shower. According to the National Plumbing Code of Canada, what is the minimum total fixture unit value for calculating the drainage piping size for this bathroom?
Answer options:
- 7 fixture units ✅ 8 fixture units
- 9 fixture units
- 10 fixture units
Correct answer: 8 fixture units
Explanation: According to the NPC Table 2.4.9.3.(1), a water closet (private use) has a drainage fixture unit (DFU) value of 3, a lavatory has a DFU of 2, and a shower has a DFU of 3. Adding these together (3 + 2 + 3 = 8) gives the minimum total fixture unit value of 8.
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