Noiseblocker NB-BlackSilentFan XL-1 120mm x 25mm Ultra Quiet Fan, 1000 RPM, 13dBA Original Noiseblocker Quality The fan is extremely quiet, reliable and fail safe The Blacksilent is designed carefully to not only last for a long time but to remain nearly silent during that entire life The ultra quiet and extremely long lasting NB-Longlife advanced sleeve bearing uses modern engineering and materials Inexpensive & Cool Rubber Mounting Screws Included Its matched with the high quality NB-EKA drive with a wear and loss rate of an unbeatable 0.01%