... 380/230/120V,50/60Hz,900/1350rpm 2.ball bearings,IP54 or IP44,S1 operation ... steel,thermal protector,UL,CE 2. Brief Introduction of Axial fan with external rotor motor YWF500— ... MODELVOLTAGE VFREQUENCY HzCURRENT AINPUT WSPEED RPMMAX AIR FLOW m³/hCAPACITOR μF NOISE dB(A)CURVEYWF4D50038050139013506570 ... & technology center... UL approval axial flow fan with external rotor motor for water chiller,freezer