Abstract: An air inlet through which supply air is blown into the room of a building or the like including at least one roller-shaped elongated blowing element, two mutually parallel disposed bearing shells between which the blowing element is mounted and at least one spring clamp. The spring clamp engages both bearing shells and retains them in assembly with the blowing element to thereby hold the blowing element in a form-fitting and positive force-transmitting manner while permitting the blowing element to pivot about its longitudinal axis. The blowing element includes walls defining a passage through which the air passes into the room. In one embodiment the walls define projections which in turn define an inlet passage for the blowing element which is narrower in width than its outlet passage.