Cooler Master Sleeve Bearing 140mm Silent Fan for Computer Cases and Radiators. These PC case fans measure 140 mm and are optimized for use in water cooling loops to cool your radiators or as standard case fans when mounted to your chassis. Recommended for CM 690 and Centurion 590. 60.9 CFM High airflow to enhance cooling performance. Super silent operation at 16 dBA for case cooling. The fans are extremely quiet and for the money you won't find a better deal. The fans plug right into your motherboard or into a controller.