Patent ID: 8662840

Claim:
A fan shroud for a cooling fan assembly, the cooling fan assembly including a fan that is rotatable about an axis of rotation and that defines a downstream direction along the axis of rotation, the fan shroud comprising: a barrel for containing the fan, the barrel concentric with the axis of rotation, and further including a base portion; and a plenum including: a plenum body extending radially from the base portion, the plenum body defining at least one edge of length L 1 ; a skirt extending proximate the at least one edge of length L 1 and substantially parallel to the axis of rotation; and an interface joining the at least one edge of length L 1 and the skirt and having a length L 1 , wherein the interface comprises an underside having a transition surface of a length less than length L 1 , wherein the underside includes a first segment located on one side of the transition surface and a second segment located on the other side of the transition surface, and wherein the transition surface is in the form of a concavity, and further wherein a radius of the concavity is greater than a radius of both the first segment and the second segment.