Red Seal Plumbing Exam 2025 – 400 Free Practice Questions to Pass the Test

Question: 1 / 400

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

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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