Air tight seals around all doors and an intake fan that filters out dirt and dust. Wire drop gap in the back of the shelves for easy access. Full length back door on cabinet makes easy access to peripherals. 4 heavy-duty 5" casters, 2 locking. 22 gauge steel construction. Lockable slide-out keyboard drawer with keyboard shelf. Lower front locking compartment with one printer shelf that adjusts on 2” centers. Each of the 3 locking doors, back full door, lower front door and keyboard door comes with 3 keyed alike keys. Flat panel kit included