Abstract: The invention relates to an impeller for radial blowers or fans, comprising a cover, a central bore for fixing to a driving shaft and a plurality of impeller blades passing in part spiral manner from the outside to the bore. Radial blowers with such impellers have an inadequate power or capacity for certain applications. In addition, they cannot be operated independently of the mains and are also overdimensioned. A high pressure impeller for small volume flows with a significantly increased efficiency and incorporated into a miniaturized, mains-independent radial blower would be highly desirable. The latter is obtained in that the cross-section Ak of the impeller blade channel in its last third up to the circumferential edge becomes smaller or remains constant, in that it is given a profile-like configuration corresponding to the impeller blade thickness, the blade entry angle &bgr;1 having a value >40°.