Patent ID: 8157540

Claim:
A fan assembly arranged on a printed wiring board comprising: a fan including a rotor and a plurality of vanes attached to a periphery of the rotor; a motor, arranged coaxially within the rotor, that drives the rotor thereby rotating the fan; and a casing that houses the fan and the motor, having an air inlet in a direction of a rotating axis of the fan and having an air outlet in a radial direction of the fan, wherein air taken in the casing from the air inlet due to rotation of the fan is ventilated to the air outlet, the casing having; a first portion that is located in an inner area of the air inlet and that includes a first surface and a second surface both of which are perpendicular to the direction of the rotating axis of the fan, the first surface opposing the printed wiring board and the second surface facing an inner space of the casing; and a second portion that is located in an outer area of the air inlet and that includes a third surface parallel to the first surface, the third surface opposing the printed wiring board, the first surface being arranged closer to a center of the longitudinal direction of the rotating axis than the third surface, the motor being mounted on the second surface of the first portion.