The most common types of Industrial Fan are as follows:
Axial fan type
The axial fan has various blade shapes including Aerofoil, Sickle, Paddle, and Variable pitch. Axial fans are used for relatively high flow rates and low pressures with flow parallel to the axis of the fan. They also have lower power input.
Axial fans are generally selected for simple extraction or cooling applications with very low system resistance, such as moving air from one large space to another (i.e. from factory to outside), desk fans and condenser cooling in refrigeration.
Tangential fan type
These barrel-shaped fans have curved forward blades that are generally many times longer than any given diameter. Tangential fans tend to scoop the air up and deliver it at relatively low pressure over a longer length, ideal for cabinet cooling or process air coverage.
The main advantage of tangential over axial fans is that they provide extremely smooth laminar airflow over the whole frame width. This makes them suitable for applications such as air conditioning systems, air curtains, computer systems, instrument racks, convector fans, ovens, dehumidifiers and ventilators.
Centrifugal fan type
Typical impeller blade construction types include Paddle, Radial, Backward Curved and Forward Curved. Characteristics are low flow rates and high pressures with flow perpendicular to the blower axis. Air enters around the centre of the fan and exits around the outside.
Centrifugal fans with Paddle impellers are used when debris will pass through the system because this configuration prevents any clogging.
Fans with backward curved blades produce less air volume than Axial units, but generate considerably more pressure and are the least hungry for power in the centrifugal range. They can also be produced as multistage units to give even higher pressures.
By comparison, the Centrifugal Fans with Forward curved blades develop the best airflow and pressure requirement in size by size comparison, although they will require extra motor power.
Typical applications for centrifugal fans include air handling units, process heating and cooling, electronic cooling and boiler combustion air.
Mixed flow fan type
These combine the features of Axial and Centrifugal Fans by employing the air movement techniques of both. Air enters the inlet side of the fans and exhausts in an axial route from the outlet side. The pressure development of the mixed flow is greater than axial and more akin to the Centrifugal.
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