Red Seal Plumbing Practice Exam 2025 – Comprehensive All-In-One Guide for Exam Success!

Question: 1 / 400

What is the correct minimum size of a fresh air inlet for a building trap?

2"

3"

4"

A 2": This is too small of a size for a fresh air inlet as it may not provide enough ventilation for the building trap.

B: 3": This is also too small and may not provide sufficient ventilation for the building trap.

D: 6": This is too large and may result in excessive ventilation, which can lead to loss of trap seal and sewer gas entering the building.

C: 4": This is the correct minimum size for a fresh air inlet for a building trap as it provides enough ventilation without risking loss of trap seal. A 4 inch fresh air inlet is the industry standard for building traps and ensures proper ventilation and prevention of sewer gas leaks.

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