Silicone frame All case fans of the AiRazor series have a silicone frame. This frame provides a vibration-free and low-noise connection with your computer case. Novel design of the fan blades Due to the newly developed design of the AiRazor fan baldes the air flow is improved and reduced the noise level to a minimum. Long life thanks to the Fluid Dynamic Bearing (FDB) The Fluid Dynamic Bearing of the AiRazor series are equipped with oil capsules to reduce the lost of the lubrication solvent. The result is a quieter operation and a longer life than normal bearings.