Patent ID: 8734087

Claim:
A multi-stage centrifugal fan assembly, comprising: a body formed to define a flow path along which fluid is directed to flow; a rotor disposed along the flow path and including at least first and second stages having substantially axially aligned rotor vanes formed to impart energy to the fluid moving in an outward radial direction when the at least first and second stages rotate about an axial centerline of the rotor; and a stator having a radial dimension and stator vanes radially interposed between and substantially axially with the at least first and second stage rotor vanes to redirect a tangential direction of flow in a direction opposite a direction of rotor rotation, each of the stator vanes being hook shaped and including a pressure surface, the pressure surface comprising a leading edge, a trailing edge, and a vertex, the leading edge located at an inner end of the pressure surface and proximate to the vanes of the first rotor stage and the trailing edge located at an outer end of the pressure surface and proximate to the vanes of the second rotor stage, the leading edge and the trailing edge being configured to lead the vertex with respect to a direction of rotation of the rotor about the centerline and relative to the radial dimension of the stator.