Definition & Treatment


Carbon monoxide is a by-product of combustion of fossil fuels. Fumes from automobiles contain high levels of CO. Appliances such furnaces, space heaters, clothes dryers, ranges, ovens water heaters, charcoal grills, fire

places and wood burning stove produce CO. Carbon monoxide usually is vented to the outside if appliances function correctly and the home is vented properly. Problems occur when furnace heat exchanger crack or vents and chimneys become blocked. Insulation sometimes can trap CO in the home.

The Consumer Product Safety Commission and the Taylor Fire Department recommend installing at least one carbon monoxide detector with an audible alarm near the bedrooms. If a home has more than one story, a detector should be placed on each story. Be sure the detector has a testing laboratory label.

Problem Sources of Carbon Monoxide

Forced Air Furnace

  • Measure the concentration of carbon monoxide in the flue gases.
  • Check furnace connections to flue pipes and venting systems to the outside of the home for signs of corrosion, rust gaps or holes.
  • Check furnace filters and filtering systems for dirt and blockage.
  • Check forced air fans for proper installation and to assure correct air flow of flue gases, Improper furnace blower installation can result in carbon monoxide build-up because toxic gas is blown into rather than out of the house.
  • Check the combustion chamber and internal heat exchanger for cracks, holes, metal fatigue or corrosion. be sure they are clean and free of debris.
  • Check burners and ignition system. A flame that is mostly yellow in color in natural gas fire
    d furnaces is often a sign that the fuel is not burning completely and higher levels of carbon monoxide are being released. Oil furnaces with similar problems can give off an oily odor. Remember you can’t smell carbon monoxide.

Venting Systems

Check all venting systems to the outside including flues and chimneys for cracks, corrosion, holes, debris, and blockages. Animals and birds can build nests in chimneys preventing gases from escaping.


  • Pilot lights can be a source of carbon monoxide because the by-products of combustion are released inside the home rather than vented outside.
  • Be sure space heaters are vented properly. Unvented space heaters that use a flammable fuel such as kerosene can release carbon monoxide into the home.
  • Barbecue grills should never be operated indoors under any circumstances nor should stove tops or ovens that operate on flammable fuels be used to heat a residence.
  • Check fire
    places for closed, blocked or bent flues, soot and debris.
  • Check the clothes dryer vent opening outside the house for lint build-up.

Outside the Home

  • Never leave a vehicle running in a garage with or without the garage door open. Inspect for exhaust leaks.
  • Never use fuel-burning heaters or lanterns while sleeping in tents, campers, RVs or other enclosed areas.
  • Do not store propane tanks indoors.
  • Start all gas-, diesel- or propane-powered equipment outside.
  • Use paint strippers and solvents outdoors or in adequately ventilated areas.
  • Even with the door open, never use a barbecue grill in the garage or house, in a trailer, van or camper.

Inside the Home

  • Avoid extensive use of kerosene heaters; always vent to outside.
  • Inspect and service heating and cooling system before each season.
  • Check water heater for improper burner adjustment and low supply of hot water.
  • Keep fireplace flue open for adequate ventilation and until embers are completely burned out.
  • If you see a mostly yellow pilot light not positioned upright, call for service; never adjust it yourself.
  • Never install or operate gas-burning appliances, furnaces or water heaters in un vented enclosures.
  • Examine chimney and vents for blockages, cracks, leaks; improper connections, rust, water, streaking, stains, debris and soot; loose, damaged, discolored bricks or masonry; hot draft or none at all.
  • Never use a gas range or oven for heating.

Things to Watch For

  • Stuffy, stale, smelly air; exhaust fume smell; unfamiliar or burning odor.
  • Moisture on walls and windows; lint by dryer’s exterior vent; soot on appliances.
  • A furnace that runs constantly but heats inadequately; loose or missing furnace panels.
  • Appliances that shut off, activating safety devices.


If you suspect carbon monoxide might be in your environment, you should turn off the heater or source of the gas, open windows to ventilate all rooms and/or go outside and get some fresh air. If in a vehicle, switch off engine and remove yourself or the person from the vehicle. Seek emergency medical assistance. When inhaled, carbon monoxide is quickly absorbed into the blood. It displaces oxygen by combining with the blood’s oxygen’s. If you find someone who you suspect maybe suffering from carbon monoxide poisoning, remove from the area and check the ABCs (Airway, Breathing and Circulation) and begin resuscitation if required.

Useful Tips

  • Install proper ventilation in all homes, mobile homes, garages and work places.
  • Ventilation, don’t block them off.
  • Use Carbon monoxide detectors in the home.
  • Remove vehicles from the garage immediately after starting the ignition.
  • Do not run a vehicle or other fueled engine or motor indoors, even if the garage doors are open.
  • Have your vehicle inspected for exhaust leaks if you have any symptoms of carbon monoxide poisoning.
  • Always use barbecue grills, which can produce carbon monoxide, outside. Never use them in the home or garage.