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

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An existing low-pressure house main was sized for 90 CFH. The owner adds a 50,000 Btu/h (50 CFH) decorative appliance. What must you do before connecting it?

Connect it; existing mains never need restudy Reduce the furnace orifice instead of checking pipe size Always replace the entire system with 2-inch pipe Recheck the existing piping capacity for the new total load using the same longest-length table row, and enlarge any undersized section

Correct Answer:

Recheck the existing piping capacity for the new total load using the same longest-length table row, and enlarge any undersized section

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