OEM ODM Available Axial Fan Motor With External Rotor With Lower Noisy,Long Life,High Efficiency CCC CE ROHS ... ,PRODUCT OVERVIEW1),YWF series axial fan motors are external rotor fan motors with the characteristics of compact structure, convenient installation, ... different cover.Brushless DC motor:Energy Saving Motor with Aluminium cover and Plactic Cover. YWF4D-600 Axial Fan Motor With External Rotor