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

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A manufacturer’s instruction for a natural-gas furnace installed at 5,000 feet says to reduce nameplate input 4 percent for each 1,000 feet above 2,000 feet. The nameplate is 100,000 Btu/h. What input should you set and use for combustion-air and gas-pipe load?

100,000 Btu/h, because altitude never changes input 88,000 Btu/h (12 percent derate: 3 × 4 percent) 96,000 Btu/h (4 percent only) 80,000 Btu/h (20 percent)

Correct Answer:

88,000 Btu/h (12 percent derate: 3 × 4 percent)

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