Shark Force 140 is SilverStone's 140mm size variant from the “Shark Force” series fans, which features integrated shark skin-like surface pattern on the fan blades for air to travel more smoothly over each fan blade to reduce noise and enhance airflow. SF140-B is equipped with Fluid Dynamic Bearing (FDB) and 4 pin PWM control function, allowing for a smooth operation at a wide PWM range of 0~2,200 RPM with high CFM and high static pressure figures.