Centrifugal fan

The utility model relates to a ventilation equipment field. Centrifugal fan, including chassis, wheel hub, a plurality of blade and outer lane, the wheel hub outside is even as an organic whole with the chassis, and the blade bottom is even as an organic whole with the chassis, and the outer lane is even as an organic whole with the lateral wall at blade top, the last a plurality of provinces material mouth that is equipped with of wheel hub, blade quantity is equipped with a plurality of provinces material hole on the chassis between 37~45, the air inlet of blade is served and is equipped with a plurality of profile of tooth breachs, and the height of profile of tooth breach is 0.5%~2% of fan blade diameter. This centrifugal fan's advantage is novel structure, and the chassis takes place to be out of shape at the shi buhui that moulds plastics, has reduced the weight and the manufacturing cost of product, and the noise is low simultaneously.