The air duct for combustion must be located how far from the ceiling and floor respectively?

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Prepare for the NFPA 54 National Fuel Gas Code Test. Enhance your knowledge with multiple-choice questions and flashcards, complete with hints and detailed explanations. Get exam-ready now!

Multiple Choice

The air duct for combustion must be located how far from the ceiling and floor respectively?

Explanation:
Combustion air should be drawn from a mid‑height portion of the space so the air is fairly well mixed and not strongly affected by hot air near the ceiling or cold air near the floor. The code specifies that the combustion air duct openings be located 12 inches from the ceiling and 12 inches from the floor. This placement keeps the intake in a stable, middle zone, reducing the potential for drafts, stratification, or drawing in air that could upset combustion or introduce combustion products into the living space.

Combustion air should be drawn from a mid‑height portion of the space so the air is fairly well mixed and not strongly affected by hot air near the ceiling or cold air near the floor. The code specifies that the combustion air duct openings be located 12 inches from the ceiling and 12 inches from the floor. This placement keeps the intake in a stable, middle zone, reducing the potential for drafts, stratification, or drawing in air that could upset combustion or introduce combustion products into the living space.

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