Noiseblocker NB-BlackSilentFan XLP 120mmx25mm Ultra Quiet PWM Fan - 1000-2000 RPM - 14-31 dBA Original Noiseblocker Quality The fan is extremely quiet, reliable and fail safe Quiet, Long Life Operation The Blacksilent is designed carefully to not only last for a long time but to remain nearly silent during that entire life Highest Durability 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% Inexpensive & Cool Rubber Mounting Screws Included