Frequency inverter in basic design with integrated, all-pole effective sine filter. For speed control of one or more fans. The permissible number of fans is determined by the maximum inverter current. The speed setting is done via the 0-10 V control signal (e.g., potentiometer PU/PA, accessories). A cable length of over 10 m between the inverter and fan is possible. No additional EMC shielding of the electrical lines is required. The fans, including the motor, do not need special EMC precautions for frequency inverter operation. The inverter is fixedly set to its rated current. When using the frequency inverter with integrated sine filter, conventional standard fans/motors can be used.