3-Pin fan with standard case value pack (5 Fans) Long Service LifeThe 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 Innovative Design Enables Quiet and Efficient VentilationThe 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. Two Way installation* Blow warm air out of the case* Draw cool air into your case