•  LEPA modular frame with LEPA logo halo ring design to increase more airflow•  S-blade with winglet design to improve cooling efficiency•  Patented Barometric Oilless (BOL) Bearing for long life span and silent spinning•  Extra 7V / 5V adapter provide 3 speed modes for maximum flexibility •  Rubber screws to reduce vibration and keep silent operation•  Removable fan blades for convenient cleaning