Flue

Common card · No. 312476

A flue is a pipe, or opening in a chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors. Historically the term flue meant the chimney itself. In the United States, they are also known as vents for boilers and as breeching for water heaters and modern furnaces. They usually operate by buoyancy, also known as the stack effect, or the combustion products may be "induced" via a blower. As combustion products contain carbon monoxide and other dangerous compounds, proper "draft", and admission of replacement air is imperative. Building codes, and other standards, regulate their materials, design, and installation. A flue is the passage within a chimney or within an appliance (appliance flue) that conveys products of combustion to the outdoor atmosphere. In U.S. model codes, the regulated venting system is the continuous open passageway from the appliance’s flue collar or draft hood to outdoors, typically consisting of a vent or chimney...

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