Features: 1. 4U 19" Rackmount Chassis 2. Supports single board computer with 14-slot backplane 3. Supports (4)5¼ ,4(2)HDD, (1)FDD* Drive Bays 4. (2) 2.0 USB ports on Front Panel 5. (1) 12 cm front fan with air filter 6. Fan failure & Temperature Alarm Board 7. Dual Lockable Front Doors and Replaceable Air Filters