Patent ID: 8277178

Claim:
A fan assembly comprising: a first fan comprising a first frame, the first frame comprising at least a pair of first projections formed at a top thereof, the at least a pair of first projections being arranged face to face, each one of the at least a pair of first projections comprising a first hook protruding towards the other one of the at least a pair of first projections, so that each of the at least a pair of first projections is L-shaped; a second fan comprising a second frame, the second frame comprising at least a pair of second projections formed at a bottom thereof, the at least a pair of second projections being arranged back to back, each one of the at least a pair of second projections comprising a second hook pointing away from the other one of the at least a pair of second projections, so that each of the at least a pair of second projections is L-shaped; wherein the at least a pair of second projections is received between the at least a pair of first projections with the second hooks of the at least a pair of second projections respectively engaging with the first hooks of the at least a pair of first projections; and wherein one of the first frame and the second frame defines at least a groove therein for receiving the at least a pair of first projections and the at least a pair of second projections therein, each pair of the first projections and a corresponding pair of second projections are received in a same one of the at least a groove, the at least a groove comprising a first opening facing the other one of the first frame and the second frame and a second opening which is perpendicular to the first opening and facing a lateral side of the one of the first frame and second frame, the at least a pair of first projections and the at least a pair of second projections are exposed to the lateral side through the second opening of the at least a groove.