Abstract: A ventilation device for supplying air to a clean room having a passage duct (16) with a waste air inlet (13) for receiving waste air form the room and a supply air outlet (14) for discharging supply air (34) to the room. A speed controllable rotatable fan (49) is provided in the passage duct (16) for conveying air from a suction chamber (47) coupled to the waste air inlet (13) to a pressure chamber (48) coupled to the supply air outlet (14). An outside air duct (22) is provided for receiving outside air (27) which is emitted into the passage duct (16), and an exhaust air duct (28) is provided for receiving a part of the waste air (32) extracted from the room for exhaust to the outside. First and second air flow regulators (36, 37) are provided in the respective air ducts (22, 28), and a control unit (68) is provided for controlling operation of the air flow regulators (36, 37) and the rotational speed of the fan (49).

Abstract: A ventilation device for supplying air to a clean room having a passage duct (16) with a waste air inlet (13) for receiving waste air form the room and a supply air outlet (14) for discharging supply air (34) to the room. A speed controllable rotatable fan (49) is provided in the passage duct (16) for conveying air from a suction chamber (47) coupled to the waste air inlet (13) to a pressure chamber (48) coupled to the supply air outlet (14). An outside air duct (22) is provided for receiving outside air (27) which is emitted into the passage duct (16), and an exhaust air duct (28) is provided for receiving a part of the waste air (32) extracted from the room for exhaust to the outside. First and second air flow regulators (36, 37) are provided in the respective air ducts (22, 28), and a control unit (68) is provided for controlling operation of the air flow regulators (36, 37) and the rotational speed of the fan (49).