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  2. Forced-air gas - Wikipedia

    en.wikipedia.org/wiki/Forced-air_gas

    Older furnaces sometimes relied on gravity instead of a blower to circulate air. [1]Gas-fired forced-air furnaces have a burner in the furnace fueled by natural gas.A blower forces cold air through a heat exchanger and then through duct-work that distributes the hot air through the building. [2]

  3. Furnace (central heating) - Wikipedia

    en.wikipedia.org/wiki/Furnace_(central_heating)

    Furnaces are mostly used as a major component of a central heating system. Furnaces are permanently installed to provide heat to an interior space through intermediary fluid movement, which may be air, steam, or hot water. Heating appliances that use steam or hot water as the fluid are normally referred to as a residential steam boilers or ...

  4. Blast furnace - Wikipedia

    en.wikipedia.org/wiki/Blast_furnace

    A blast furnace is a type of metallurgical furnace used for smelting to produce ... The downward flow of the ore along with the flux in contact with an upflow of hot, ...

  5. Passive ventilation - Wikipedia

    en.wikipedia.org/wiki/Passive_ventilation

    When there is a temperature difference between two adjoining volumes of air the warmer air will have lower density and be more buoyant thus will rise above the cold air creating an upward air stream. Forced upflow buoyancy driven ventilation in a building takes place in a traditional fireplace.

  6. Industrial furnace - Wikipedia

    en.wikipedia.org/wiki/Industrial_furnace

    An industrial furnace, also known as a direct heater or a direct fired heater, is a device used to provide heat for an industrial process, typically higher than 400 degrees Celsius. [1] They are used to provide heat for a process or can serve as reactor which provides heats of reaction.

  7. Furnace - Wikipedia

    en.wikipedia.org/wiki/Furnace

    Furnace (central heating): a furnace, or a heater or boiler, used to generate heat for buildings; Boiler, used to heat water; also called a furnace in American English when used for heating and hot water in a building; Jetstream furnace or Tempest boiler, a design of wood-fired water heater

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