Difference "Blower Fan" with relatively large centrifugal fan: ⒈ different works, using a curve centrifugal fan blades, gas by centrifugal force flung the cabinet office and the Roots blower with two 8-shaped blades the gap between them is small, relying on two blades squeeze, squeeze through the gas outlet. ⒉ due to the different works, in general they work different pressure, outlet pressure blower is relatively high, and relatively small centrifugal fan. Different ⒊ air flow, generally used in the blower air volume requirements of small but pressure for higher ground, while the centrifugal fan with low pressure requirements, air flow requires a large place. ⒋ manufacturing precision is not the same, high blower required accuracy, the assembly requirements are very strict, and the centrifugal fan looser.