What is the primary purpose of a flue?

The primary purpose of a flue is to safely vent combustion gases outside the building. Flues are essential components in various heating systems, such as furnaces, water heaters, and boilers. They facilitate the expulsion of harmful byproducts of combustion, including carbon monoxide and other gases, ensuring that these potentially dangerous substances do not accumulate indoors where they could pose serious health risks.

In the context of building safety and code compliance, proper venting is critical not only for occupant safety but also for the efficient operation of the heating system. By directing these gases outside, flues help maintain indoor air quality and prevent hazardous conditions in occupied spaces. Therefore, understanding the function of a flue is vital for anyone involved in HVAC design, installation, or maintenance.