Patent ID: 7422420

Claim:
An axial fan ( 1 ), rotating in a direction (V) in a plane (XY) about an axis ( 2 ), comprising a central hub ( 3 ) with a radius (Rmin), a plurality of blades ( 4 ) each having a root ( 5 ), a tip ( 6 ) which extends to a tip radius (Rmax), the blades ( 4 ) being delimited by a convex leading edge ( 7 ) and a concave trailing edge ( 8 ), the axial fan being characterised in that the leading edge ( 7 ) comprises a first circular arc segment ( 9 ) close to the root ( 5 ) with a radius of between 79% and 97% of the tip radius (Rmax) and a second circular arc segment ( 10 ) close to the tip ( 6 ) with a radius of between 49.5% and 60.5% of the tip radius (Rmax), and a radius at the change between the two circular arc segments ( 9 , 10 ) of between 40% and 48.5% of the extension (Rmax−Rmin) of the blade ( 4 ).