... appearance 3.lower noise and little vibration 4.high insulation class 5.high efficiency Specification: 1, Protection class: IP442, Power ... Speed: 750r/m , 1000r/m ,1500r/m, 3000r/m4, Voltage: 220V,380V, 400V,415V,440V, 660V,5, Frequency: 50Hz/60Hz6 ... noise, little vibration,4. high insulation class, etc.Product data:Samples:Certification; Three Phase High-Voltage Squirrel Cage Totally Enclosed Fan ...