At Duty Cycle 0-20%: 900 RPM At Duty Cycle 50%: 1700 RPM At Duty Cycle 100%: 2800 RPM At Duty Cycle 0-20%: 15.1 CFM At Duty Cycle 50%: 30.9 CFM At Duty Cycle 100%: 46.96 CFM Aluminum Radial Fin Heatsink with Copper Inserted