1. Blocked vents or chimney*
  2. Fireplace
  3. Portable fuel heater
  4. Stove
  5. Improperly installed cook top vent*
  6. Stored BBQ
  7. Car
  8. Furnace
  9. Water Heater
  10. Dryer

*These are not sources of carbon monoxide but are critical to CO safety.


Yellow Flames

Check the flame on all natural gas appliances regularly (it should be blue – a yellow burner flame can be a sign of carbon monoxide).

Blocked Vents or Chimneys

A blocked or restricted vent/chimney will reduce flue performance, increasing the chances of CO or other fumes spilling into the home. Be sure to clean your vents/chimneys regularly.


Car Exhaust

Despite having properly maintained exhaust systems, it is still possible that CO could get into your vehicle. Also, if you are idling in cold weather with poor ventilation the heating system can draw CO into the vehicle.


Remember to check and replace your furnace filter at least every three months. To be sure that your furnace exhaust system is working properly, it should also be inspected routinely by a licensed professional.

In Case of a Leak

  • Ensure that all people and pets leave the home immediately.
  • Call 911 or your local fire department.
  • If anyone in the house feels ill, get immediate medical attention. Symptoms may include flu like symptoms without the fever, impaired motor functions, chest pain, tiredness or dizziness, and nausea.

Learn more by viewing our CO safety checklist at www.www.cga.ca

Did You Know?

Many provinces have taken necessary steps to help reduce incidences by establishing new regulations making carbon monoxide alarms mandatory in all residential homes.