NV C-1F Heating And Air Practice Questions - Nevada C-1F Heating, Cooling And Circulating Air Contractor Examination Exam

Carbon monoxide from a gas-fired warm-air furnace is produced primarily by which condition?

Complete combustion with excess outdoor air A high-limit switch that opens on a temperature rise A listed Type B vent with the required 1 inch clearance Incomplete combustion from a cracked heat exchanger, blocked vent, or starved burner

Correct Answer:

Incomplete combustion from a cracked heat exchanger, blocked vent, or starved burner

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