What are the different types of centrifugal fans?

Centrifugal Fan: Types The major types of centrifugal fan are: radial, forward curved and backward curved(see Figure 5.3). Radial fansare industrial workhorses because of their high static pressures (upto 1400 mm WC) and ability to handle heavily contaminated airstreams.

What is the impeller aspect ratio of a centrifugal fan?

Centrifugal fans are normally fitted with impeller aspect ratios greater than 0.5 Axial fans are normally fitted with impeller aspect ratios less than 0.5 (where flow is of greater importance than pressure) Irrespective of design criteria, an impeller’s aspect ratio should ensure that its airflow is not compromised.

How does a centrifugal fan increase air velocity?

Centrifugal fans use a rotating impeller to increase the velocity of an airstream. As the air is sucked in direction to the blades, it gains kinetic energy. The kinetic energy is then converted to a static pressure increaseas the air slows before entering the discharge. 2.) Axial Fans: Axial fans move an airstream along the axis of the fan.

How is a centrifugal fan like a paddle wheel?

Fans may also be classified into two major types with reference to their mechanical design. A centrifugal fan resembles a paddle wheel. Air enters near the centre of the wheel, turns through a right angle and moves radially outward by centrifugal action between the blades of the rotating impeller.

They are suitable for high pressure applications as compared with axial flow fans. Generally centrifugal fans have three types of blade: forward blade, backward blade and radial blade. The characteristic curve of three kinds of centrifugal fan is shown in Figure 2.15. Figure 2.15. Fan static pressure and air volume for different centrifugal fans

Can a centrifugal fan be mounted on a wall?

Complete range of centrifugal and axial flow fans for wall – ceiling – in-line – window or surface and recessed mounting applications.

How does a forced draft centrifugal fan work?

The blades rotate to move the air to discharge through the outlet at a 90° angle. Similarly, a forced draft centrifugal blower sucks the air and/or other materials into the inlet and rotates to push it out the outlet at a 90° angle and blow the clean or material-laden air, gas or liquid through the system.

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