Sunon (PF40561BX-Q40U-S9H) FAN-0163L4 is a standard fan for 1U 4-GPU series chassis. This fan has been fully tested and validated by Supermicro to ensure the best quality and cooling performance. Manufacturer Sunon Fan Size 40mm Rated Fan Speed 23300 RPM [Inlet] / 20300 RPM [Outlet] Acoustic Noise Level 69.4 dBA Maximum Airflow Rate 34.8 CFM Rate Current (A) 1.9A Connector 4 Pin Dimensions 40L x 40H x 56W (mm) Search Terms B8-04056CSU-001T001, A8-04056CSU-001T001, D04112620G-01 Warranty 1 year warranty Product Environmental Compliance RoHS and REACH compliant, details available upon request