Patent ID: 8459967

Claim:
An axial flow fan, which is arranged in a rotatable manner around an axis in a stationary shroud ring, the axial fan comprising fan blades partially encased within the shroud ring, wherein the shroud ring has an essentially cylindrical annular surface with an axial extension from a leading edge to a trailing edge and the fan blades have an axial depth from an inflow edge to an outflow edge, wherein the outflow edges of the fan blades in the axial direction project beyond the trailing edge of the annular surface and form a blade overhang, wherein flow guidance elements are arranged radially outside the fan blades as well as in an axial region of the blade overhang, wherein the flow guidance elements have trailing edges, which are arranged in a same radial plane as an axially outermost outflow edge of the fan blades, and wherein the flow guidance elements are disposed on and extend from an outflow end of the shroud ring.