NATE GS Installation Practice Questions - NATE Gas Heating (Air) Installation Specialty Exam

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When supplying combustion air to a confined space using two permanent openings drawn directly from outdoors through vertical ducts, each opening must have a minimum free area of:

1 square inch per 1,000 Btu/h 1 square inch per 2,000 Btu/h 1 square inch per 4,000 Btu/h 1 square inch per 3,000 Btu/h

Correct Answer:

1 square inch per 4,000 Btu/h

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