SC Heating Practice Questions - South Carolina Heating Contractor Examination Exam

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Using IFGC 304.6.1, two permanent outdoor combustion-air openings that communicate directly with the outdoors or through vertical ducts shall each have a minimum free area of which amount?

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

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