3-Pin fan with standard case 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.