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175mm Ec Backward Curved Centrifugal Fan, 115V 230V Centrifugal Ventilation Fan, External Rotor Centrifugal Blower Fan for HVAC and Telecom Systems, Find Details and Price about Industrial Extractor Fan Air Extraction Fan from 175mm Ec Backward Curved Centrifugal Fan, 115V 230V Centrifugal Ventilation Fan, External Rotor Centrifugal Blower Fan for HVAC and Telecom Systems - NINGBO LONGWELL ELECTRIC TECHNOLOGY CO., LTD.