DC FAN 120mmx 120mmx25mm Housing: Plastic P.B.T. Blade: Plastic P.B.T. Insulation Resistance: 10MR at 500VDC between lead and frame Dielectric Strength:1 mm at 500VAC150.60HZ.current< 5mA Operation Temperature:-150C^- 750C Operation Humidity: 20%-85% Working voltage: Rated Voltage 1 1 5 % Life at 250C: Ball bearing 60.000hr.sleeve bearing 30.000hr