Capacity:90 Millimeter Less Noise at Higher Airflow At low fan speed, the motor noise is the key. A motor developed in Germany with a new alloy/lubricant combination reduces friction and noise at the case fan. Here, the ARCTIC impeller is quiet and at a given low fan speed, it moves more air than standard impellers at lower generation of noise of the F9 Silent. Long Service Life The Fluid Dynamic Bearing comes with an oil capsule that avoids lubricant leakage. Thus, this bearing is as quiet as a sleeve bearing, but comes with a significantly higher service life. Innovative Design The innovative design of the fan blades of the F9 Silent improves the airflow and facilitates highly efficient ventilation. The impeller was designed with a focus on minimizing the noise level, yet delivering the desired airflow and pressure. 6-year warranty At ARCTIC, we believe in our products. That's why we back the case fan with a 6-year manufacturer warranty and provide friendly, easy-to-reach support.