"The top window is in the shape of an X with another 80mm fan at the center. Just like on the side and back, the fan is secured using self-tapping screws and a chrome grill (as opposed to stamped grills). Feel free to replace it with any custom guard of your choosing. The X-Turbine comes stock with a total of six pre-installed 80mm fans, four black and two clear (with blue LEDs) mounted up front. Having this top window is a great way to show of a transparent PSU cover mod and any optical optical drive mods you may have done. It also allows for light to shine through. Cold cathodes are almost a must if you get a case like this."