Industrial Exhaust Fans: Industrial Exhaust Fan is really a generic term that could include any type of fan or blower. An industrial exhaust fan could be a Centrifugal type Blower or an Axial type Fan. What defines them as “Industrial” is the construction, materials and gauges. Centrifugal blowers differ from axial flow fans in the way they move the air. A centrifugal blower typically has one of seven types of wheels that draws 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. An axial flow fan uses a propeller to draw the air into it and discharges it in the same axial direction. An “air moving device” with a propeller is typically referred to as a Fan, while one with a wheel is typically referred to as a Blower.