Fans are used for circulating air in rooms and buildings; for cooling motors and transmissions; for cooling and drying people, materials, or products; for exhausting dust and noxious fumes; for conveying light materials; for forced draft in steam boilers; and in heating, ventilating, and air-conditioning systems.
A fan is a powered machine used to create a flow of air. A fan consists of a rotating arrangement of vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner.
Mechanical devices that move air and other gases are essential to human comfort and safety and to some industrial processes. Broadly speaking they are of three types. Fans deliver large amounts of air or gas at low pressure, blowers have high rates of delivery at medium pressure, and compressors deliver at high pressure.
Electric fans have a motor that moves blades that are attached to a central rotating hub. Other common power sources for fans include internal-combustion engines and steam or gas turbines.
Fans circulate air to cool and ventilate rooms and to control humidity. Heating, ventilating, and air-conditioning systems of all sizes use fans to move air through ducts, coils, filters, and building spaces. Fans exhaust heat, odors, smoke, and noxious, corrosive, or flammable vapors from enclosed areas. They cool motors, transmissions, and industrial products.
Fans are also employed for drying and for blowing light materials from one place to another.
Electric fans have a motor that turns a shaft on which there is an impeller. The turning impeller creates air pressure, causing air flow.
If the fan moves air in the same direction as its shaft, it is axial flow. Propeller fans are axial flow. If the fan blows air in a sunburst pattern, or radially, around its shaft, it is centrifugal. There are also mixed-flow fans. They move air in a combined axial and radial direction.
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