Patent ID: 7811055

Claim:
A fan housing for an air-flow heat exchanger comprising a fan blower comprising: an axial-flow fan and a drive motor, wherein the blower is connected to the fan housing by struts, and wherein the struts have a cross-sectional profile with a front edge and a rear edge and a strut height h and a strut width b, wherein the front edges of the struts are arranged in a non-planar, spherical or spheroidal surface; wherein the surface is generated by a non-linear curve branch rotating about the axis of rotation of the blower, the branch comprising a distance x from a radial plane that increases with increasing distance from the axis of rotation, wherein the curve branch is curved in the air-flow direction L; wherein the struts are arranged to form a strut lattice having points of intersection; and wherein the points of intersection are arranged on an ellipse.