SC Heating Practice Questions - South Carolina Heating Contractor Examination Exam

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Where two outdoor combustion-air openings communicate with the outdoors through horizontal ducts, IFGC 304.6.1 requires each opening to have a minimum free area of which amount?

1 square inch per 2,000 Btu/h of total input 1 square inch per 3,000 Btu/h of total input 1 square inch per 4,000 Btu/h of total input 1 square inch per 5,000 Btu/h of total input

Correct Answer:

1 square inch per 2,000 Btu/h of total input

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