... brushless fan 12v 2.size:70*70*15mm 3.Sleeve / ball bearing 4.Low noise,low power loss,long life 5.OEM ... Operating Temperature: 25°C-45°C3. Life Expectancy: Dual Ball Bearing: 55000 hours Sleeve Bearing: 20000-30000 hours4. Standard: Fully CE, ROHS Approved ...