Supermicro FAN-0104L4 is a standard fan for CSE-743TS and CSE-745BTS series chassis. This fan has been fully tested and validated by Supermicro to ensure the best quality and cooling performance. 80 x 80 x 25mm Axial Fan Compatible with CSE-743TS and CSE-745BTS Series Chassis Fan Speed: 2,800 RPM Manufacturer: Sanyo Denki Supermicro Certified