A plumber is connecting a floor drain to a 75 mm branch drain. What is the maximum vertical distance a trap of a floor drain can be located from its vent pipe opening, assuming no intermediate connections, to still be considered effectively vented?

Question: A plumber is connecting a floor drain to a 75 mm branch drain. What is the maximum vertical distance a trap of a floor drain can be located from its vent pipe opening, assuming no intermediate connections, to still be considered effectively vented?

Answer options:

• 1.2 m
• 1.5 m ✅ 1.8 m
• 2.4 m

Correct answer: 1.8 m

Explanation: For a floor drain, the maximum vertical distance a trap can be located from its vent pipe opening to be considered effectively vented is typically 1.8 m according to the NPC. Exceeding this distance can compromise venting effectiveness, leading to potential trap seal loss.