Abstract: A ventilation system which provides a ventilating unit which can be installed without structural constraints, and air flow can be controlled effectively by setting the direction of nozzles in various directions and also can reduce the noise from air resistance. The system includes: a damper which is formed in the rear side of the ventilating unit and having barriers which are formed in up and down sides of the inner plane of the ventilating unit alternatively; a blower unit which is connected to the damper and a fan is installed centered by a hinge therein; an ejector which is connected to the blower unit so that the air from the fan of the blower unit is ejected through a nozzle body which is installed therein.