Meet the Thermaltake Core V21 Micro Chassis: a micro M-ATX-based chassis with a flexible thermal solution. It is designed to allow you to upgrade your computer easily. With its externally-modular upgrades, you can create dual systems. The Core V21 has a 200 mm fan on the front panel and supports sophisticated cooling solutions.
The Core V21 supports vertical or horizontal motherboard placement. This expandable product has modular drive racks that allow you to easily install up to six data storage devices. The Core V21 is optimized for space management and cooling. You can find out more about it here.