Noiseblocker NB-BlackSilentPro PR-2 60mm x 25mm Ultra Silent Fan - 2500 RPM Size: 60mm x 60mm x 25mm RPM: 2500 (+/- 10%) Static pressure: 0.890 mm-H2O Air Flow: 17.1 CFM (12V) acustical noise: ca. 16.8 dB/A