Centrifugal Blower Fan

How a centrifugal fan works the rotating fan blade creates a low pressure area at the center of the blade and a high pressure area at the edges of the blade.

Centrifugal blower fan.

The scroll housing in a centrifugal fan accelerates the air and changes the direction of the airflow twice a full 90 degree before leaving the housing. Centrifugal blowers or fans are among the most efficient and versatile pieces of air moving equipment. In addition to material handling applications centrifugal air blowers are popular for the hvac industry and air pollution control systems. Equipment cooling blowers create a more concentrated stream of air than equipment cooling fans to blow away the heat generated by electronic equipment induction heaters and high wattage bulbs.

It also adds kinetic energy to the air. The two most common types of centrifugal blowers are pressure blowers and volume blowers. Such a fan is also called a blower fan biscuit blower or squirrel cage fan because it looks like a hamster wheel. Centrifugal fans often contain a ducted housing to direct outgoing air in a specific direction or across a heat sink.

Centrifugal fans and blowers typically have one of eight types of wheels that draw the air into the inlet of the blower housing through the wheel and discharges it at 90 degrees out through the discharge of the housing. Direct drive fans have fewer moving parts than belt drive fans for less maintenance.