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Plumber Red Seal · Question

What is the minimum vertical distance required between the flood level rim of a fixture and the highest possible level of a connected vent pipe termination?

The vent pipe must terminate at least 6 inches (150 mm) above the flood level rim of the highest fixture served, but typically 12 inches (300 mm) is a common st

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Question: What is the minimum vertical distance required between the flood level rim of a fixture and the highest possible level of a connected vent pipe termination?

Answer options:

  • 6 inches (150 mm) ✅ 12 inches (300 mm)
  • 18 inches (450 mm)
  • 24 inches (600 mm)

Correct answer: 12 inches (300 mm)

Explanation: The vent pipe must terminate at least 6 inches (150 mm) above the flood level rim of the highest fixture served, but typically 12 inches (300 mm) is a common standard to account for potential backsplash or pressure fluctuations.

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