What kind of issues can flue gases cause to a chimney?

Flue gases can cause corrosion and deterioration in a chimney primarily due to their chemical composition and the high temperatures at which they travel. When combustion occurs, flue gases are produced, which can contain harmful constituents such as water vapor, sulfur dioxide, and carbon dioxide.

When these gases cool inside the chimney, particularly in the presence of moisture from the air or condensation inside the chimney, acids can form. These acids can then corrode the metal components of the chimney liner and the masonry materials if the chimney is not properly designed or maintained. Over time, this corrosion and deterioration can lead to structural integrity issues, potentially causing harmful gases to escape into living spaces or increasing the risk of fire.

The phenomenon is particularly pronounced in chimneys that are not used regularly or in conditions where flue gas temperatures are not high enough to ensure proper venting. Thus, addressing the possibility of corrosion and deterioration is crucial for the safe and efficient operation of a chimney system.