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In order to improve the aerodynamic characteristics of a plug-in fan, modifications of the blading geometry have been carried out. Hereby, changes take the restriction into account, which, with respect to the product costs, result from a simple design. Centrifugal plug-in fans are being broadly applied in ventilation and air conditioning systems. Hereby, manufacturing costs require simple blading forms to achieve saleable products. Whereas the flow due to axialradial and circumferential turning shows complex, threedimensional structures. Calculated flow fields, which arise in a conventional designed ventilator, are presented first on the basis of numerical simulations. The geometry of the blade is formed by the cut-out of a cylinder surface, whose axis is aligned parallel to the machine axis. Without abandoning the simple cylindrical form, there are geometric alternatives through the incline of the cylinder axis in two directions in order to affect the flow field in a positive manner. In the second part of the paper the geometric model is illustrated. Details of the simulations show the influence of the modifications on the incidence angle as well as the implications on the spanwise mass flow distribution. The studies indicate an increase of approximately 2 % in efficiency.