Description You may consider several aspects when choosing a case fan, UF 140 is one which has more features than you expect. The special fan blade design with AACC Technology (Airflow Auto-Control Channel) optimize the airflow to be uniform; dual ball bearing ensures the fan has a smooth rotation and long lifespan. SILENT OPERATION The main structure is made of plastic to maintain a strong structure. The outside is covered with soft and elastic TPE material, which can absorb the operating vibration maximally. These features together with dual ball bearing can keep the fan operating quietly. HIGH PERFORMANCE This fan can push up to 71.8 CFM, which is sufficient to cool down high-end rig. PWM CONTROL The fan speed is auto-controlled by PWM Control system which reduces power consumption and noise level.