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Forced-Draft Fan (FD Fan)

Last updated: September 18, 2017

What Does Forced-Draft Fan (FD Fan) Mean?

A forced-draft (FD) fan is a type of pressurized fan that gives off positive pressure within a system. It is mainly used in industries that employ boiler systems in order to promote boiler efficiency, but it has a wide range of applications.

Typically, outlet and inlet dampers are utilized in order to maintain the pressure in the system. A common FD fan has a wheel at the center that hangs on a shaft along with integrated inlet boxes.


Corrosionpedia Explains Forced-Draft Fan (FD Fan)

Draft, in the context of boilers, is defined as the difference between the pressure within the boiler and the atmosphere. In some cases, it is also described as the pressure difference in combustion chambers that leads to air flow and flue gas movement.

Forced draft occurs when flue gases or air are retained beyond atmospheric pressure. Generally, this is achieved by using tools like a forced-draft fan. This type of fan can be used in various industries and processes such as:

  • Energy
  • Cement
  • Chemical/petrochemical
  • Pharmaceutical
  • Control of air pollution
  • Extraction of dust
  • Incineration of steel parts
  • Mining
  • Ventilation
  • Handling of fire gas

With the aid of forced-draft fans, regulation of air flow in large and small industries can be achieved more efficiently. Resistance to impact, slip and corrosion are also among the benefits of using FD fans, making them vital industrial tools.


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