SILENT OPERATION: The New Silent Series is crafted fof Silent Enthusiasts and boasts the newly designed high-airflow impeller, advanced Hydrodynamic Bearing, and noiseless motor driver IC. ANTI-VIBRATION: Fan mounts replace traditional screws and are made of temperature-resistant rubber which stops vibrations from the fan motor from travelling into your PC case. LONG LIFETIME: Fluid Dynamic Bearing increased the lifespam of the fan to over 50.000H MTTF ad 40°C TECHNICAL SPECIFICATION: Air Flow (CFM): 21 DC Voltage 12V dBA: Max. 18.9 Static Pressure (mmH2O): 1.05