Delta Electronics FFB1212EH 120 x 120 x 25mm PWM Cooling Fan, 4000 RPM, 150.33 CFM, 56.4 dBA, 4-pin PWM connector RPM: 4000 Air Flow: 150.33 CFM Noise Level: 56.4 dBA Dimensions:120 x 120 x 25mm Power Connector: 4-pin PWM