Model : BL4447-04W-B49Dimensions : 110 * 110 * 28MMBearings: High -precision double ball bearingVoltage : 12VCurrent : 2APower : 19.2WSpeed : 5500RPM ± 250RPMNoise : 65dB AWind : 62.49CFMWiring : 2P Materials: Housing is steel , plastic material leavesSteel temperatureAdditional features :Support speed function , support PWM speed control functionMaintain the bestContinuous operationTime10,0000 hoursFeatureMaintenance- double ball bearing , long life, With sufficient cooling air volume and pressure ..