Noiseblocker NB-BlackSilentFan X2 80mmx25mm Ultra Quiet Fan - 1800 RPM - 16 dBA Dimensions: 80 x 80 x 25 mm, Speed: 1800 RPM, Max Airflow: 26.5 CFM (45 m3/h), Noise Level: 18 dBA Bearing: Long life sleeve bearing, Connector: 3-pin, MTBF at 25C: 80,000 hours Designed in Germany 3 year manufacturer warranty Soft rubber fan screws included for anti-vibration mounting