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

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A direct-vent (sealed-combustion) furnace takes all combustion air from outdoors through a concentric or two-pipe terminal. How is it treated in the UMC Chapter 7 indoor-volume calculation for other room-air appliances?

Its input is still added to the indoor combustion-air load It is omitted from the indoor confined-space volume calculation because it does not use room air It must also have two 100-square-inch room openings Direct-vent appliances are prohibited in New Mexico

Correct Answer:

It is omitted from the indoor confined-space volume calculation because it does not use room air

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