Fan Impeller an overview | ScienceDirect Topics
Belt, rope and chain drives. WTW (Bill) Cory, in Fans and Ventilation, 2005 Introduction. It might be thought desirable to arrange all fans to be directly driven, with the fan impeller mounted directly on the shaft extension of the driving motor. There are however, a number of reasons for arranging for an indirect drive through belts, ropes or chains and suitable pulleys or sprockets.