A flue plays an essential role in the evacuation of combustion gases. If it is not perfectly sealed, it can become a source of danger for the occupants of a dwelling. This type of problem is often invisible to the naked eye, but its consequences can be serious, ranging from simple malfunctions to real health and safety risks.

Flue gas leaks: a silent danger

A cracked or poorly connected flue can release toxic gases such as carbon monoxide. This colorless, odorless gas can accumulate undetected in living areas, causing headaches, nausea and even fatal poisoning in the event of prolonged exposure.

Fire hazard

When smoke is not properly vented, the flue temperature can rise, igniting soot deposits or nearby combustible materials. A leaking flue near insulation or wood can easily start a chimney fire.

Poor draft and loss of efficiency

A leaking duct often leads to a weakening of the draught. This results in :

• poor combustion
• soot accumulation
• reduced heating system performance
• excessive energy consumption
  

The system heats less well and consumes more, which means higher costs and a greater environmental impact.

What to do when in doubt

If you suspect a leak, it’s imperative not to use your chimney or stove until you’ve consulted a professional. A video inspection of the flue, accompanied by a tightness test, provides a precise diagnosis. If the problem is confirmed, the flue may need to be lined or renovated.

Conclusion

A leaking flue is not a detail to be taken lightly. To keep your home safe, be sure to have your system checked regularly. Our experts can intervene for a professional chimney sweep or a heating emergency if the situation calls for it. Don’t wait for a simple defect to become a real danger.