Carbon monoxide in the home is released when fuels such as natural gas propane oil wood or coal do not burn completely often due to faulty or poorly ventilated appliances like furnaces water heaters stoves fireplaces generators or vehicles running in enclosed spaces The buildup of this odorless and colorless gas Carbon monoxide usually occurs when there is insufficient oxygen for proper combustion or when exhaust vents are blocked which allows it to accumulate without being noticed
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The information for this answer was found on our Carbon Monoxide & Smoke Detector Laws answers.