Noiseblocker NB-BlackSilent Fan X-2 80mm Ultra Silent Fan, 1800rpm, 3 pin,18 dBA Noiseblocker BlackSilentFan X-1 80mm Silent Classic Design Fan 1800rpm Fan speed 18.2 dBA Noise level 26.49 CFM Airflow Fan Dimensions: 80mm x 80mm x 25mm