At Duty Cycle 0-20%: 1000 RPM At Duty Cycle 50%: 2500 RPM At Duty Cycle 100%: 4500 RPM At Duty Cycle 0-20%: 10.12 CFM At Duty Cycle 50%: 25.30 CFM At Duty Cycle 100%: 45.56 CFM Aluminum Extruded Radial Fin Heatsink with Copper Inserted