Noiseblocker NB-BlackSilentFan XE1 92mmx25mm Ultra Quiet Fan - 1500 RPM - 17 dBA 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 and is matched with the high quality NB-EKA drive with a wear and loss rate of an unbeatable 0.01% Rubber Mounting Screws Included Inexpensive & Cool