The device (100) has an air supply device (20) and an air suction device (30) cooperated during operating the device for forming an air flow path. The supply device is attached to a floor-close region of a small room (1) and includes an inlet opening (21) in one of side walls (11) or a floor (12) of the small room. The suction device is attached above the supply device or on a same height of the supply device. The supply device is aligned against a workplace (50) i.e. operating table, which is present in the small room, and positioned in an area of corners of the side walls.
