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The article presents a description of design work for newly created centrifugal fans. This was done on the example of an innovative solution that uses a change in impeller geometry. In the described solution, this is achieved by shortening and lengthening the impeller blades. The development of a technical solution with such properties requires a change of approach in the design process compared to classic solutions. Therefore, the following text describes this process from concept stage to demonstrator tests. The principle of operation of such a solution is also presented and the assumptions made on the basis of analytical calculations are described. The text also shows a 3D model of the centrifugal fan with variable impeller geometry, made with the help of CAD tools. In the further part, numerical calculations were made on its basis. The FEM calculation made it possible to verify the structural strength of the project, its modal properties as well as to verify flow parameters, thanks to the use of CFD calculations. The next step describes the procedure for testing centrifugal fans with variable rotor geometry, which is different from that of fans without this feature. The next part presents the results of research from the tests carried out.