Patent ID: 7255532

Claim:
A bi-directional blower, comprising: a motor; a rotary unit, comprising: a hub mounted to the motor; and blades extending from the hub; and a housing receiving the motor and the rotary unit, the housing comprising a first air inlet, a first air outlet, a second air inlet, a second air outlet, a first partition wall located adjacent to ends of the blades and between the first air inlet and the second air outlet, and a second partition wall located adjacent to the ends of the blades and between the first air outlet and the second air inlet, wherein: the housing is divided into first and second subspaces by the blades and the first and the second partition walls; the first and the second partition walls have widths that are greater than a blade pitch; a first channel is formed with the first air inlet, the first subspace, and the first air outlet; and a second channel is formed with the second air inlet, the second subspace, and the second air outlet.