The dual flow created by the dual blade impeller increases the airflow for powerful cooling Performance and delivers the efficient airflow to educe noise. EBR (Long Life Bearing) applied, minimizing noise and inflow of the dust for longer life span. Different from typical system fans, the housing support is designed in the reverse direction so that Friction caused by structure can be removed for more efficient airflow. Provides 3 step rpm speed with a built-in fan controller, it can be fine tuned for superior performance or quietness. Anti-vibration pad? helps to reduce the vibration efficiently & allows silent operation.