LUEFTERAGGREGAT

摘要

The invention relates to a fan installation with at least one pole changing asynchronous motor (6, 7) to drive a fan (8, 9) in which there is a regulating system (14, 15) by means of which the speed of the asynchronous motor (6, 7) is continuously regulatable within a predeterminable revolution speed range by reducing the voltage. The rotation speed of the fan (8, 9) can thus be matched to the required air flow rate or quantity of heat to be dissipated by only a few switchovers or switching on processes.