Abstract: A vacuum cleaner fan with an electric drive motor having a stator assembly and a rotor. The stator assembly and rotor are disposed in a bearing pot. An at least single-stage fan unit is driven by the electric motor. The fan unit includes a guide stage, a suction cap, and an impeller that is configured to generate an air stream. The bearing pot includes a receiving pocket which holds an adapter housing. The adapter housing accommodates a printed circuit board. A power semiconductor operable to control rotational speed of the fan unit is included on the printed circuit board. At least a portion of the power semiconductor protrudes from the adapter housing into the vicinity of the air stream generated by the fan unit.