An air diffuser for an air outlet. The air diffuser is mounted to a ceiling or wall surface and has an inner plate member with an opening communicating with the air outlet. A plurality of nozzles extend from the inner plate member and are positioned at predetermined intervals around the periphery of the inner plate member. An outer plate member is fastened to the inner plate member so as to sandwich the nozzles therebetween.
An air diffuser apparatus has a box-like air diffuser chamber with sheet metal side walls, that are provided with a series of laterally spaced outlet orifices. Each orifice is formed by cutting out wing portions of the sheet metal on each side of a center line of the orifice and bending the wing portions outwardly to a position inclining toward this center line. The wing portions define an air flow passage tapering in an outward direction. The chamber has a base connected to a lower edge of the side walls that includes a layer of heat insulation material. An upper structure closes the upper end of the chamber and has an inlet opening for introducing pressurized low temperature air into the chamber. This arrangement is highly efficient for diffusion of low temperature air and can be of essentially all-metal construction.
