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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
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Correct Answer:
1 square inch per 4,000 Btu/h
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