1Adopts lightweight magnalium frame, which is 15% lighter than ordinary aluminum alloy frame, with low density and high strength, which is more than 23 times that of ordinary aluminum alloy. 2With highquality ball bearings, maintenancefree for long hours, high efficiency 3The product has 5 blades, and the speed can reach more than 2600 per minute 4Processed by CNC machine tools, bearing position accuracy is high, fan running vibration is small 5The ball bearing fan is suitable for exhaust, heat dissipation and refrigeration Item Type: Ball Bearing Fan Material: Magnalium Purpose: Exhaust, heat dissipation, refrigeration Temperature:Ball Bearing Fan (B): -20+60; Relative Humidity: 90%95% Air Pressure: 55Kpa(G)74.8Kpa(H) Vibration: Vibration Frequency 10-55Hz Low-frequency Limiting Double Amplitude: 1.5mm Insulation Resistance: AC1500-100M Withstand Voltage: 1800V/S 1 x Fan