Patent ID: 7866952

Claim:
A fan comprising: a rotatable center member to rotate in a direction and centered relative to an axis of rotation of the fan; and, a plurality of blades radially extending from the rotatable center member, each blade having a side profile being non-linear and comprising: a curvy shape, such that the side profile of the blade has plurality of C-shapes extending from a top of the blade to a bottom of the blade, the C-shapes organized in pairs of C-shapes, each C-shape except for a top C-shape and a bottom C-shape being a member of two of the pairs of C-shapes, each pair of C-shapes including a first C-shape and a second C-shape such that a bottom end of the first C-shape touches a top end of the second C-shape, wherein all the C-shapes are oriented such that the C-shapes are open towards the direction in which the rotatable center member is to rotate.