AC fan & DC fan & Cooling fan.Housing: Plastic P.B.T. or Aluminim houseingBlade: Plastic P.B.T.Insulation Resistance:10MΩat 500VDCbetween lead and frameDielectric Strength:1 min at 500VAC/50-60HZ ,current5mAOperation Temperature: -15ºC75ºCOperation Humidity: 20%85%Working voltage: Rated Voltage ±15%Life at 25ºC: Ball bearing 60,000hr, sleeve bearing 30,000hr,Ball + Sleeve Bearing 45,000hr