axial fan and cooling fan Housing: Aluminumor Plastic FrameBlade: Plastic P.B.T.Insulation Resistance:10MΩat 500VDCbetween lead and frameDielectric Strength:1 min at 1500VAC/50-60HZ ,current5mAOperation Temperature: -20ºC80ºCOperation Humidity: 20%85%Working voltage:85V125V for 110V and 190V250V for 220VLife at 25ºC: Ball bearing 60,000hr and sleeve bearing 30,000hr