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Flue
 
 
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A flue is a duct
Duct (HVAC)

Ducts are used in HVAC to deliver and remove air. These needed airflows include, for example, supply air, return air, and exhaust air....
, pipe
Pipe

selfref|For Wikipedia guidelines on the use of "pipe links", see...
, or chimney
Chimney

A chimney is a structure for venting hot flue gases or smoke from a boiler, stove, furnace or fireplace to the outside Earth's atmosphere. Chimneys are typically vertical, or as near as possible to vertical, to ensure that the gases flow smoothly, drawing air into the combustion in what is known as the stack effect....
 for conveying exhaust gas
Exhaust gas

Exhaust gas or flue gas is emitted as a result of the combustion of fuels such as natural gas, gasoline/petrol, diesel, fuel oil or coal....
es from a fireplace
Fireplace

A fireplace is an architecture structure to contain a fire for heating and, especially historically, for cooking. A fire is contained in a Firebox or firepit; a chimney or other flue directs gas and particulate exhaust to escape....
, furnace
Furnace

File:Piec krepa.JPGA furnace is a device used for heating. The name derives from Latin fornax, oven. The earliest furnace was excavated at Balakot, a site of the Indus Valley Civilization, dating back to its mature phase ....
, water heater, boiler
Boiler

A boiler is a closed Pressure vessel in which water or other fluid is heated. The heated or vaporized fluid exits the boiler for use in various processes or heating applications....
, or generator
Electrical generator

In electricity generation, an electrical generator is a device that converts mechanical energy to electrical energy, generally using electromagnetic induction....
 to the outdoors. In the U.S.A., for water heaters and modern furnaces they are also known as 'vents' and for boilers as 'breeching'. They usually operate by buoyancy
Buoyancy

In physics, buoyancy is the upward force that keeps things afloat. The net upward buoyancy force is equal to the magnitude of the weight of fluid displaced by the body....
, also known as the stack effect
Stack effect

Stack effect is the movement of air into and out of buildings, chimneys, flue gas stacks, or other containers, and is driven by buoyancy. Buoyancy occurs due to a difference in indoor-to-outdoor air density resulting from temperature and moisture differences....
, or the combustion products may be 'induced' via a blower
Fan (mechanical)

A mechanical fan is an electricity powered device used to produce an airflow for the purpose of creature comfort , Ventilation , exhaust, or any other gaseous transport....
. As combustion products contain carbon monoxide
Carbon monoxide

Carbon monoxide, with the chemical formula CO, is a colorless and odorless, tasteless, yet highly toxic gas. Its molecules consist of one carbon atom covalent bond to one oxygen atom....
 and other dangerous compounds, proper 'draft', and admission of replacement air is imperative.






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Encyclopedia


A flue is a duct
Duct (HVAC)

Ducts are used in HVAC to deliver and remove air. These needed airflows include, for example, supply air, return air, and exhaust air....
, pipe
Pipe

selfref|For Wikipedia guidelines on the use of "pipe links", see...
, or chimney
Chimney

A chimney is a structure for venting hot flue gases or smoke from a boiler, stove, furnace or fireplace to the outside Earth's atmosphere. Chimneys are typically vertical, or as near as possible to vertical, to ensure that the gases flow smoothly, drawing air into the combustion in what is known as the stack effect....
 for conveying exhaust gas
Exhaust gas

Exhaust gas or flue gas is emitted as a result of the combustion of fuels such as natural gas, gasoline/petrol, diesel, fuel oil or coal....
es from a fireplace
Fireplace

A fireplace is an architecture structure to contain a fire for heating and, especially historically, for cooking. A fire is contained in a Firebox or firepit; a chimney or other flue directs gas and particulate exhaust to escape....
, furnace
Furnace

File:Piec krepa.JPGA furnace is a device used for heating. The name derives from Latin fornax, oven. The earliest furnace was excavated at Balakot, a site of the Indus Valley Civilization, dating back to its mature phase ....
, water heater, boiler
Boiler

A boiler is a closed Pressure vessel in which water or other fluid is heated. The heated or vaporized fluid exits the boiler for use in various processes or heating applications....
, or generator
Electrical generator

In electricity generation, an electrical generator is a device that converts mechanical energy to electrical energy, generally using electromagnetic induction....
 to the outdoors. In the U.S.A., for water heaters and modern furnaces they are also known as 'vents' and for boilers as 'breeching'. They usually operate by buoyancy
Buoyancy

In physics, buoyancy is the upward force that keeps things afloat. The net upward buoyancy force is equal to the magnitude of the weight of fluid displaced by the body....
, also known as the stack effect
Stack effect

Stack effect is the movement of air into and out of buildings, chimneys, flue gas stacks, or other containers, and is driven by buoyancy. Buoyancy occurs due to a difference in indoor-to-outdoor air density resulting from temperature and moisture differences....
, or the combustion products may be 'induced' via a blower
Fan (mechanical)

A mechanical fan is an electricity powered device used to produce an airflow for the purpose of creature comfort , Ventilation , exhaust, or any other gaseous transport....
. As combustion products contain carbon monoxide
Carbon monoxide

Carbon monoxide, with the chemical formula CO, is a colorless and odorless, tasteless, yet highly toxic gas. Its molecules consist of one carbon atom covalent bond to one oxygen atom....
 and other dangerous compounds, proper 'draft', and admission of replacement air is imperative. Building code
Building code

A building code, or building control, is a set of rules that specify the minimum acceptable level of safety for constructed objects such as buildings and nonbuilding structures....
s, 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 bricks are covered in a decorative material such as brick, tiles or stone. This flue gas circulation avoids the considerable heat loss to the chimney and outside air in conventional systems. The heat from the flue gases is absorbed quickly by the bricks and then released slowly to the house rather than the chimney. In a well insulated home, a single load fire burning for one and a half hours twice a day is enough to keep an entire home warm for a 24 hour period. In this way, less fuel is used, and noxious emissions are reduced. Sometimes, the flue incorporates a second combustion chamber where combustibles in the flue gas are burnt a second time, reducing soot, noxious emissions and increasing overall efficiency.

The term flue is also used to define certain pipe organ
Pipe organ

The pipe organ is a keyboard musical instrument that produces sound by venting mechanically compressed air through resonant Organ pipe. Each pipe produces sound at one fixed pitch, so they are provided in sets or "ranks" with one pipe or more per note, each rank having a common timbre and loudness throughout....
 pipes, or rather, their construction or style. Roman Thermae
Thermae

The terms balnea or thermae were the words the Ancient Rome used for the buildings housing their public baths.Most Roman cities had at least one, if not many, such buildings, which were centers of public bathing and socialization....
s constructed centuries ago had flues.

Flue-types

Flue-types include
  • balanced flue
  • power flue
  • die flue


See also

  • Flue gas stack
    Flue gas stack

    A flue gas stack is a type of chimney, a vertical pipe, channel or similar structure through which combustion product gases called flue gases are exhausted to the outside air....
  • Combustion
    Combustion

    Combustion or burning is a complex sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat or both heat and light in the form of either a glow or flames, appearance of light flickering....
  • Masonry heater
    Masonry heater

    A masonry heater is a device for warming a home that captures the heat from periodic burning of fuels , and then radiates that heat over a long period at a fairly constant temperature....
  • Shell or flued boiler
    Shell boiler

    A shell or flued boiler is an early, and relatively simple, form of boiler used to make steam, usually for the purpose of driving a steam engine....