What are the differences between centrifugal fan and furnace fan?

We all know centrifugal fan and furnace fan, but what's the difference between them? There are four main points as follows:

1. The latter is more complex to install;

2. The motor of the former is generally connected with the fan by driving the rotating wheel through the belt, while the motor of the latter is generally in the fan;

3. The kiln fan does not change the flow direction of the medium in the air duct, while the centrifugal fan changes the flow direction of the medium in the air duct;

4. The former is often installed at the inlet and outlet of air conditioning unit, boiler drum, induced draft fan, etc. The latter is often installed in the middle of the air duct or in the front of the air duct outlet.

The discharge shell expands slowly to slow down the flow of air or gas and convert kinetic energy into useful static pressure. In addition, there are diagonal (mixed flow) fans. The air pressure coefficient is higher than that of furnace fans, and the flow coefficient is larger than that of centrifugal fans. It fills the gap between furnace fan and centrifugal fan. The flow is varied by changing the angle of the blades in the inlet housing upstream of the impeller. At the same time, it has the characteristics of simple and convenient installation. The mixed flow (or axial flow) fan combines the characteristics of the kiln type and centrifugal fan, although it looks more like the traditional kiln type fan. The enclosure may have an open inlet, but more commonly it has a right angled bend shape that allows the motor to be placed outside the pipe. Weld the curved plate blade on the conical steel hub.