What does a flue do in a building's ventilation system?

A flue in a building's ventilation system serves a critical role in safely removing combustion products, such as smoke and gases, generated by appliances like furnaces, boilers, or fireplaces. By conveying these potentially harmful substances to the outside, the flue helps maintain indoor air quality and ensures occupant safety.

This function is essential because without a properly installed and maintained flue, dangerous gases could accumulate within the building, leading to health risks or even life-threatening situations. The design of a flue often includes features that facilitate the effective expulsion of these gases while preventing backflow into the living space.

Understanding the role of the flue highlights its importance in the overall efficiency and safety of a building's heating system and ventilation practices.