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

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Using the standard two-opening 'all indoor air' method, each combustion-air opening connecting a confined furnace space to an adjacent room must have a minimum free area of:

1 square inch per 4,000 Btu/h 1 square inch per 1,000 Btu/h, not less than 100 square inches 1 square inch per 2,000 Btu/h Half the appliance input in square inches

Correct Answer:

1 square inch per 1,000 Btu/h, not less than 100 square inches

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