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

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All combustion air will come from outdoors through two openings that communicate directly, or by vertical ducts, with the outdoors. For 120,000 Btu/h, what net free area is required for each opening?

120 square inches each 60 square inches each 30 square inches each 15 square inches each

Correct Answer:

30 square inches each

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