Patent ID: 8534988

Claim:
A fan assembly comprising: a mounting bracket comprising two side plates bounding an outlet, each side plate defining a through hole, an inner side bounding the through hole defining an arc-shaped cutout, communicating with the through hole; a fan mounted in the mounting bracket, between the side plates; and a baffle pivotably mounted to the side plates at the outlet, wherein the baffle comprises two pins pivotably received in the through holes of the side plates, correspondingly, a protrusion protrudes out from each pin to be engaged in the cutouts, wherein when the fan operates, the baffle is pushed by air from the fan to rotate to uncover the outlet, to allow the air from the fan to flow out of the mounting bracket through the outlet; when the fan ceases operation, the baffle rotates under force of gravity to a position to cover the outlet, where the protrusion resists against one end of the cutout such that further rotation is prevented, to prevent air intake into the mounting bracket through the outlet through the outlet.