140mm PWM 500 ~ 2000 R.P.M High Air Pressure Fan Blade: 100 CFM High Air Flow Fan Blade: 109 CFM Reverse Fan Blade: 107 CFM Hydraulic High Air Pressure Fan Blade: 34.3 dB-A High Air Flow Fan Blade: 32.7 dB-A Reverse Fan Blade: 36.1 dB-A