ARCTIC F14 PWM - 140 mm PWM Case Fan I Silent Cooler with Standard Case | PWM-Signal regulates Fan Speed | Push- or Pull Configuration Possible INNOVATIVE DESIGN ENABLES QUIET AND EFFICIENT VENTILATION: The innovative design of the fan blades improves the air flow and facilitates a highly efficient ventilation. PERFECT CASE FAN REGULATION WITH PWM: The PWM function allows the motherboard to run the fan precisely at its necessary speed. This guarantees the required cooling. FAN CONTROLLER MADE IN GERMANY: The ARCTIC F14 PWM fan is well known for high airflow at a comfortable noise level. The real improvement is the motor and controller. INDIVIDUAL INSTALLATION: Warm air is blown out of the case. Cold air is drawn into the case from the outside. ONG SERVICE LIFE: The Fluid Dynamic Bearing comes with an oil capsule that avoids lubricant leakage. Thus this bearing is as quiet as a sleeve bearing.