Patent ID: 8740560

Claim:
A fan module comprising: at least one fan unit, the at least one fan unit comprising: a box-shaped shell comprising a bottom plate and two opposite side walls substantially perpendicular to the bottom plate, each side wall having a vent defined therein; a guiding plate rotatable relative to the bottom plate of the shell; and a torsion spring comprising a first torsion arm, a second torsion arm, and a coil portion connecting one end of the first torsion arm and one end of the second torsion arm, the first torsion arm and the second torsion arm being urged against the bottom plate and the guiding plate respectively by torque force applied from the coil portion, and the guiding plate thereby driven to a position adjacent and generally parallel to one of the side walls to obstruct the corresponding vent by the second torsion arm; and a pair of opposite panels fixed in the shell, wherein a bottom corner of each panel has a through hole defined therein; the guiding plate has a free end and a second end opposite to the free end, the second end of the guiding plate comprises two opposing elongated cylindrical connecting rods, the two connecting rods are coaxial and extend in directions parallel to a main body of the guiding plate, and ends of connecting rods farthest from each other are inserted into the through holes of the two panels, respectively, such that the second end of the guiding plate is pivotably connected with the bottom plate of the shell.