Carbon monoxide (CO) is produced whenever any fuel such as gas, oil, kerosene, wood, or charcoal is burned.
If appliances that burn fuel are maintained and used properly, the amount of CO produced is usually not hazardous. However, if appliances are not working properly or are used incorrectly, dangerous levels of CO can result.
Colorado law requires carbon monoxide detectors in all homes with a fuel-fired heater or appliance, a fireplace, or an attached garage. A CO detector must be installed within 15 feet of each room used for sleeping.