A flue pipe is a type of pipe used to vent exhaust gases from appliances like furnaces, boilers, and water heaters to the outside atmosphere. It helps ensure that harmful gases, such as carbon monoxide, are safely expelled, preventing them from entering living spaces. Flue pipes are typically made of metal or other heat-resistant materials to withstand high temperatures. These pipes come in various sizes and configurations, depending on the appliance and the building's design. Proper installation and maintenance of flue pipes are essential for safety and efficiency, as blockages or leaks can lead to dangerous situations.