... HInsulation resistance: AC1500V (50 / 60HZ)Insulation resistance: DC 500V 100MOperating temperature: 0 ~ 45.Life: 30000 hours of ball bearingOil bearing 15000 hoursCharacteristic ... light weight, large air volume, low noise, high strength, low vibration, high Wen Jia, long life advantages.The perspective of ... 110 / 220V 40 / 42W, blade diameter 50MM, length 42CM:. high quality cross flow impeller