... /4001, smooth operation and long life; the fans of the moment of inertia is small, high precision dynamic balance, smooth operation, ... 400400220508080460060125030512-14480×480×3101, debug, detailed inspection before operation of various fan parts, rotating impeller should be no slack ... the drive belt tension, lubrication (grease).6, in case of winter snow, freezing date, must always be switched on to ...