In building terms, what does the term 'flue' refer to?

The term 'flue' specifically refers to a channel or duct that directs combustion gases from appliances, such as furnaces, water heaters, or fireplaces, safely outside of a building. Its primary function is to vent hazardous gases, including carbon monoxide, away from occupied spaces, ensuring a safe environment within the structure. Proper installation and maintenance of the flue are crucial for efficient operation and safety, as any blockages or damages can lead to dangerous situations such as backdrafts or the accumulation of toxic gases indoors. In this context, understanding the role of a flue is essential for compliance with building codes and safe building practices.