Patent ID: 7591867

Claim:
A ventilation system comprising: a case having at least one inlet and two outlets communicating with an indoor space, the case being mounted on a ceiling of a room, the inlet and the outlet being provided on a bottom surface of the case, and the inlet arranged between the two outlets; an air guide to enclose the inlet and define a first space therein and a second space thereout, the air guide having an opening to allow the first space and the second space to communicate with each other; a partition to define and isolate a third space from the second space; an exhaust duct connected to the case, the exhaust duct in communication with the third space which is in fluid communication with the indoor space through an additional inlet provided on the bottom surface of the case; an air supply duct connected to the case to allow the case to communicate with an outdoor environment, the air supply duct in fluid communication with the first space; a fan vertically provided within the case over the air guide, the fan vertically and axially blowing in air from the first space and radially blowing out the drawn air into the second space; and an air purifying member provided within the second space, the air purifying member purifying the indoor air or the outdoor air introduced into the case, wherein the air purifying member is provided on an exhaust passage of the fan for maintaining a height of the case.