NM CID MM-2 Practice Questions - New Mexico CID MM-2 Natural Gas Fitting Examination Exam

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A single permanent outdoor opening commencing within 12 inches of the top of the enclosure will supply combustion air for 120,000 Btu/h of indoor-air appliances. What net free area does the one-opening method require?

30 square inches, the same as two vertical openings 100 square inches minimum regardless of input 60 square inches, the same as two horizontal ducts 40 square inches, and not less than the sum of the vent-connector areas

Correct Answer:

40 square inches, and not less than the sum of the vent-connector areas

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