The conduit used to convey the waste gases from combustion processes of a boiler, fire or similar. The term is often used differentially to denote a preformed structure used in the construction of a...

A flue is a duct, pipe, or chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors. In U.S.A. and for water heaters and modern furnaces, they are also called 'vents'; for boilers they are...