140mm Quiet Airflow PWM Case FanNZXT Quiet Airflow Fans offer high-performance. low-noise cooling for heat-prone PCs. Optimized blades and a chamfered frame provide powerful concentrated air. while fluid dynamic bearings and PWM control keep things quiet and efficient.Optimized for AirflowNine sickle-style blades move large amounts of air. whether used for intake or exhaust.Efficient DesignMinimal blade-to-frame gap maximizes the spinning area for optimal performance.Powerful CoolingChamfered frame directs air in a concentrated pattern that travels far into the case.Low Noise. Long LastingFluid dynamic bearings ensure quiet operation with a 60.000-hour lifespan.Speed RegulationPWM control adjusts speed based on system temperatures for efficient. quiet cooling.Silent & StableSturdy frame and rubberized corners absorb vibration noise.