ARCTIC F12 PWM - 120 mm PWM Case Fan | Silent Cooler with Standard Case | PWM-Signal regulates Fan Speed | Push- or Pull Configuration possible INNOVATIVE DESIGN ENABKES QUIET AND EFFICIENT VENTILATION: The innovative design of the fan blades improves the air flow and facilitates a highly efficient ventilation. The impeller was designed with a focus on minimzing the noise level yet delivering the desired airflow and pressure. 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 and minimizes the noise level. TWO WAY INSTALLATION: Blow warm air out of the case. Draw cool air into your case. LONG 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 but comes with a significantly higher service life. 4-Pin PWM fan with standard case.