There are many kinds of fans by size of pressure and flow rate of the conveyor and flow according to the intended use, table 1 are divided into several types of centrifugal force, which operate centers of escape criticism in the direction perpendicular to stream flow axial scan, which creates a fluid (air) in the same direction as shaft cross flow which is located between the two above, and other, however to be able to install and connect the pipes. Centrifugal fans sometimes look outside, and then it looks like the axial flow axial flow fan in General, are suitable for low pressure-high flow rate. The centrifugal high pressure suit
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