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Fan Engineering Fundamentals

A fan is power driven rotary machine which causes a continuous flow of Air. A fan has a rotating bladed impeller. The blades exert force on air, raising its pressure and maintaining a continuous flow of air.

There are two broad categories of fans. Axial and Centrifugal. This classification is based on the direction of air flow in the fan with respect to the of rotation of the impeller. In axial flow fans, the direction of air flow is in line with the axis of rotation of the impeller. In centrifugal Fans, the air flow through the impeller is in a radially outward direction and the air flow at fan outlet is perpendicular to the axis of rotation.

Axial flow Fans operate on the principle of deflection of air flow by the fan blade. The pressure is produced simply by the lift of the rotating blade as air moves over it. However in centrifugal fans, the operating principle is a combination of deflection by the blades as well as wheel and thereby moving outward in a radial direction. Therefore, for the same impeller diameter and speed, a centrifugal fan produces more static pressure than an axial flow fan.

Belt Drive Centrifugal Fan Series FDC : DIDW Forward inclined blades Square Outlet, diameter from 315 to 1000 mm capacities upto 80000m3/h

Belt Drive Centrifugal Fan Series BDC: DIDW Backward inclined blades Square Outlet, diameter from 315 to 1000 mm capacities upto 100000m3/h

Backward Centrifugal Fan Series MS-LL: DIDW/SISW Backward inclined blades Square Outlet, diameter from 450 to 2000 mm capacities upto 200000m3/h