Patent ID: 7399161

Claim:
A centrifugal fan, comprising: a hub; an impeller comprising a plurality of blades, each of the blades, without directly contacting the hub, having a non-paraxial side and a paraxial side mounted around an outer circumference of said hub, wherein the paraxial sides of said blades are formed to have backward leaning structures, the non-paraxial sides of said blades are formed to have forward leaning structures, and each of the paraxial sides of said blades has a chamfer structure at an inlet side of the impeller; and a connecting portion outwardly and radially extending from the outer circumference of said hub, wherein the paraxial sides of said blades are fixed to said connecting portion in order to be fixed to said hub, the forward leaning structures are arranged apart from the connecting portion, and the chamfer structure is located apart from the connection portion at an axial height.