Appliances fueled with gas, oil, kerosene, or wood may produce carbon dioxide. if these appliances are not installed, maintained, and used properly, carbon monoxide may build up to dangerous levels. common sources include gas cooking ranges, hot water heaters and dryers, wood- or coal-burning stoves and fireplaces, oil burners, and kerosene heaters. Gas water heaters and dryers and oil burners must have stacks that direct the carbon monoxide outside. Wood-burning stoves and fireplaces must have chimneys that vent the gas outside. Unvented kerosene heaters spread carbon monoxide gas indoors; therefore, a window must always be open slightly when a kerosene heater is being used. carbon monoxide is also found in the exhaust of internal combustion car engines.

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