The AKASA Viper Black Fan fan has a height of only 25 mm and is therefore ideal for smaller computers, HTPC and wherever you need to save every millimeter of precious space. The low profile fan has a PWM speed control in the range of 600 - 1900 rpm./ min and is able to produce a static pressure of 1.98 mm-H2O at maximum speed. It produces a maximum noise of 23.8 dB (A) at the highest load, with the air flow through the cooler reaching 83.63 CFM. The HDB hydrodynamic bearing is used for low noise and long service life. The connection is 4-pin, so you can drive speeds even from software directly from Windows.