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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 'breeching'. 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.
Flues are designed to release noxious gases to the atmosphere, but they
often have the disadvantage of releasing useful heat to the atmosphere. In
some countries, wood fire flues are often built into a heat preserving
construction within which the flue gases circulate over heat retaining
bricks before release to the atmosphere. The heat retaining brick
