SC Air Conditioning Practice Questions - South Carolina Air Conditioning Contractor Examination Exam

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A 100,000 Btu/h Category I furnace takes all combustion air from outdoors through two vertical ducts (two-permanent-openings method). Each opening must have a minimum free area of:

33 square inches 50 square inches 10 square inches 25 square inches

Correct Answer:

25 square inches

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