Gas Heat ESCO Practice Exam

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To burn one cubic foot of Natural Gas completely, at least how many cubic feet of combustion air must be available?

  1. 10 cu ft.

  2. 15 cu ft.

  3. 20 cu ft.

  4. 5 cu ft.

The correct answer is: 10 cu ft.

When burning natural gas, the ideal air-to-fuel ratio for complete combustion is approximately 10:1. This means that for every 1 cubic foot of natural gas burned, you would need 10 cubic feet of combustion air for optimal combustion and efficiency. Therefore, the correct answer is A: 10 cu ft. Option B, 15 cu ft, Option C, 20 cu ft, and Option D, 5 cu ft, do not align with the 10:1 air-to-fuel ratio required for complete combustion of natural gas.

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