Windtunnel is a very positive and simple model. On the side panel, there are twin large 25cm fans producing massive air , one targets directly to the Motherboard ,AGP and Memory ram module, the other is to the 3.5” & 5.25” bays (Hard drive , CD/DVD Rom & Burner). Both fans directly cool the main heat source of interior of the case, and users can observe the interior temperature by thermometer on the front panel and adjust the fans speed. Moreover, it can make your HDD’s installation more efficiently; also each case has 6 HDD trays. There is also a door on the front panel to keep the dust out and give the case a sleek look when closing it. If you need an excellent function with a stylish and a low profile look, XClio Windtunnel will be your best choice to settle your precious hardware components.