The most common source of CO in a home is the open flames from ovens and ranges. These appliances should never be used for heating homes. Furnaces and water heaters can be sources of CO if they are not vented properly. If they are vented properly, CO and other hot products of combustion escape to the outside through the vent. You may also put them in your work place and, if you have a power boat, in its sleeping cabin.
Detectors sound an alarm when a danger level in the air is reached.
Customers should be aware that CO is not just in the furnace, as some would have you believe. In fact most CO fatalities are not related to equipment in the home, but to cars and trucks and other kinds of vehicles. While we agree that carbon monoxide can be a problem in the home, its risk should not be overstated. Concentrations are measured in parts of CO per million parts of oxygen. The alarm warns you to ventilate the area and to search for the poison's source.