Why should a carbon monoxide detector be used in any room where gas-fired space heaters are being used?
A) The efficiency of gas-fired space heaters drops when the CO level in the room exceeds 500 ppm.
B) Because CO is an integral component of natural gas, a CO detector will alarm if there are any small gas leaks in the gas line.
C) High levels of CO can cause nuisance trips of the space heater's oxygen depletion sensor.
D) Gas-fired space heaters can produce carbon monoxide if the space they are operating in does not have adequate combustion air.
D
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