Carbon monoxide (CO) is an odorless, colorless gas that can be fatal. It's produced by the incomplete burning of fuels like natural gas, propane, oil, and wood. In the home, the most common sources are furnaces, boilers, water heaters, and fireplaces. As a certified gas fitter with over 20 years of experience in the Lower Mainland, I've seen firsthand how critical proper maintenance and awareness are to preventing a tragedy. This is not something to take lightly.

The Dangers of Improper Ventilation

The primary danger of CO comes from improperly ventilated appliances. A modern high-efficiency furnace, for example, has a complex venting system. If that system is blocked by a bird's nest, debris, or snow and ice, the toxic gases can't escape outside. Instead, they back up and silently fill your home. The same risk applies to older boilers or water heaters where the chimney or flue is compromised. This is why annual inspections by a certified professional are not just recommended—they are essential for your safety.

Recognizing the Symptoms of CO Poisoning

Because you can't see or smell it, the only way to detect CO is with a proper detector. However, you must also be aware of the physical symptoms of CO poisoning, which are often mistaken for the flu. If multiple people in your home suddenly experience these symptoms, it's a major red flag.

• Dull headache
• Weakness and dizziness
• Nausea or vomiting
• Shortness of breath and confusion
• Blurred vision and loss of consciousness

If you suspect a CO leak, the immediate steps are critical: get everyone out of the house into fresh air immediately, and then call 911 from outside the home. Do not re-enter for any reason until emergency services have declared it safe.

Your Non-Negotiable Safety Checklist

Protecting your family is straightforward but requires diligence. First, install CO detectors on every level of your home, especially near sleeping areas, and test them monthly. Second, never use portable fuel-burning devices like camp stoves or generators inside your home or garage. Finally, and most importantly, schedule an annual maintenance check-up for all your fuel-burning appliances with a licensed and certified technician. This is the single most effective step you can take to prevent a CO leak before it starts.