Any fuel-burning appliance that is malfunctioning or improperly installed can create carbon monoxide.
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Furnaces, gas range/stove, gas clothes dryer, water heater, portable fuel-burning space heaters, fireplaces, generators and wood burning stoves
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Vehicles, generators and other combustion engines
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Blocked chimney or flue
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Cracked or loose furnace exchanger
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Back drafting and changes in air pressure
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Operating a grill in an enclosed space