Description:* This case fan has 7 vanes, DC brushless motor.* The case fan is a high performance case fan for anyone looking for a quiet and efficient case fan.* The refined impeller design not only improves the laminar airflow, but it also lowers the noise level significantly.* The case fan have a standard frame, making it possible to install the fans either intaking or outtaking air in the PC case.Features:- Extremely quiet- High airflow and static pressure- Low Noise Impeller- Fluid dynamic bearing extends service life