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133mm AC Backward Curved Centrifugal Fan Impeller, 115V 230V Centrifugal Blower Wheel for Duct Mount Centrifugal Ventilation Fan Applications, Find Details and Price about Centrifugal Fan Backward Centrifugal Fan from 133mm AC Backward Curved Centrifugal Fan Impeller, 115V 230V Centrifugal Blower Wheel for Duct Mount Centrifugal Ventilation Fan Applications - NINGBO LONGWELL ELECTRIC TECHNOLOGY CO., LTD.