... "=S: One sleeve bearing( Duration :25,000h/25°C,p/vt) "X"=B: One ball bearing( Duration :50,000h/25°C ... ,p/vt) "X"=L:Lashy bearing( Duration :45,000h/25°C,p ... /vt)---Patent MODELVoltage VFrrq HzCurrent APower WSpeed RPM Noise DbaAirflowStatic Pressure ... 0.1111/92450/290030/3430/3718/223.4/3.9 80*80*22.5mm ac brushless fan