ATCS 840 constitutes a classic all-aluminum design that builds on the legacy of the original ATCS design. The aluminum construction not only allows for a lighter weight but complements the thermal design seamlessly with three 230mm fans, dedicated air duct for graphics card cooling and HDD cooling module for superb cooling. Extra attention to make sure this elegantly design chassis is easy to install and maintain, which includes: slide-out motherboard tray along with easy CPU cooler-remove slot, tool-free HDD casing, patented finger pressing 5.25" drive to dust filter.