Red Seal Plumbing Practice Exam

An outside fresh air supply must be installed at least how many inches above finished grade level?

6 inches 8 inches 10 inches 12 inches

Correct Answer:

12 inches

Explanation:

Installing an outside fresh air supply too low to the ground can lead to potential dangers, including contamination from rain, snow or debris on the ground and also poses a risk of tampering or damage. Option A, B, and C are all too close to the ground to provide adequate protection and proper air flow. Option D at 12 inches ensures that the fresh air supply is high enough to avoid these potential hazards.

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