Noiseblocker NB-BlackSilentPro PC-P 80mm x 15mm Ultra Silent PWM Fan - 2500 RPM Size: 80mm x 80mm x 15mm RPM: 600-2500 (+/- 10%) Static pressure: 01.890 mm-H2O Air Flow: 8.2 - 30.6 CFM (12V) acustical noise: ca. 6.2 - 25.8dB/A