Radial fan housing

The invention relates to a housing (1) of a radial fan for use in an air conditioner, with a rotatably mounted fan wheel, with a arranged in the axial direction of the fan impeller inlet port and, arranged in the radial direction of the fan wheel outlet opening (4), wherein the outlet opening (4) in the direction of flow (6) is aufweitender diffuser (5) is arranged downstream of and the fan is disposed in an inner volume (2) of the housing (1), wherein at least one of the inner volume (2) bounding housing wall (3) of a plurality of openings ( 9, 16, 17, 20, 24, 25) formed crossing region (8, 14, 15, 19, 23) is formed and at least one chamber (7, 13, 18, 22, 27) outside of the housing (1) is arranged wherein the chamber (7, 13, 18, 22, 27) the passage region (8, 14, 15, 19, 23); completely covered and the passage region (8, 14, 15, 19, 23) fluidically with the internal volume (2) of the housing (1) is connected.