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Let's see the difference between centrifugal fans and axial flow fans
The primary difference between centrifugal and axial flow fans lies in the fact that centrifugal fans alter the flow direction of the medium within the duct, while axial flow fans do not; the former has a more complex structure; the motor and fan of the former are generally connected via a belt-driven roller, while the motor of the latter is generally inside the fan; the former is often installed at the inlet and outlet of air conditioning units, boiler induced draft fans, etc., while the latter is often installed beside the duct or at the front end of the duct outlet.
In addition, there are cross-flow (mixed-flow) fans, which have a higher pressure coefficient than axial flow fans and a larger flow coefficient than centrifugal fans. They fill the gap between axial flow fans and centrifugal fans. They also feature simple and convenient installation. Mixed-flow (or axial-flow) fans combine the characteristics of axial and centrifugal fans, although they look more like traditional axial fans.
Curved vane blades are welded onto a conical steel hub. The flow rate is changed by altering the blade angle in the impeller's upstream inlet housing. The casing can have an open inlet, but more commonly it has a right-angled bend shape, allowing the motor to be placed outside the duct. The volute casing slowly expands to decelerate the air or gas flow and convert kinetic energy into useful static pressure.
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