Most industrial fans are made out of similar materials and operate the same way. What differentiates the fans are the motors that power them and the shape of the fan blades.
The Composition of Industrial Fan Blades
The industrial fans need to be made out of heavy-grade materials that are able to resist the forces that industrial fans are often placed under. Some are made out of steel and others are made out of polypro. Polypro is a thermoplastic polymer that is known for its strength and rigidity. Industrial fans do not use wooden blades, which are mostly only found in residential homes and are simply decorative.
The blades are designed to have one of a variety of shapes. The types of blades selected is largely the result of how much volume the fan will need to generate, how efficient the fan must be and how dirty the air is.
Some fans incorporate moisture and are referred to as misting fans. They release a small amount of water along with the airflow.
The fan is powered by a motor or turbine. Many fans are connected directly to an electric motor with no out-put. However, with powerful industrial fans, it is often necessary to use three-phase motors that are placed near the fan and manipulate it through a system of belts and pulleys. If the fan is connected to a larger machine that has a rotating part, the fan is often instead attached directly to the rotating part rather than being powered by a separate motor. Fans come with a variable speed driver that is an AC controller, DC and a drive. Alternatively, it could be a variable speed drive, referred to as a fluid drive, which is powered by hydraulics. The variable speed drives allow for fans to be more efficient while still remaining powerful.