be quiet! Silent Wings fans stand for state-of-the-art technology, virtually inaudible operation and superior cooling. The third generation of this award-winning fan series offers unrivaled and uncompromising performance with a broad range of meticulous optimizations. They feature a smooth-running 6-pole motor, an advanced fluid-dynamic bearing, a unique airflow-optimized fan blade design and a fan frame with funnel-shaped air inlets. The Silent Wings 3 140mm PWM model combines all of the above best-in-class features. It strikes the perfect balance between cooling and silence with a maximum of 15. 5d B(A) and meets all the requirements to be a perfect choice for heat sinks, PC cases and radiators. Main Features Virtually inaudible operation at max. 15. 5d B(A) 6-pole fan motor with three phases giving very low power consumption and less vibration Advanced fluid-dynamic bearing (FDB) enables a super long fan life of up to 300, 000 hours Seven fan blades with optimized surface structures ensure excellent airflow The rubberized fan frame is equipped with funnel-shaped air inlets producing extremely high air pressure Removable anti-vibration mountings minimize the transmission of vibrations to the PC case and its components Advanced high quality IC motor controller reduces electrical noise