Multi-air-duct centrifugal fan

The utility model discloses a multi-air-duct centrifugal fan. Fan housing, an air inlet is formed in the top of the fan shell; a circular groove is formed in the outer wall of the top of the fan shell; a filter screen cylinder is arranged on the outer wall of the top of the fan shell; a handle is installed on the outer wall of the top of the filter screen cylinder, air outlet pipes distributed atequal intervals are inserted into the outer wall of the circumference of the draught fan shell, silencing sponges are pasted to the inner walls of the air outlet pipes, a fixed shell is installed on the outer wall of the bottom of the draught fan shell, and a motor is installed on the inner wall of the bottom of the fixed shell. According to the utility model, before use, the filter screen cylinder is inserted into the circular groove in the fan shell; the silencing sponge and the impeller are arranged to block external dust, large-particle floated floccules and the like, dust is prevented from being accumulated on th