Standard: EIA RS-310C 19" Rackmount Standard Construction: Heavy Duty Cold Rolled Electroplated Steel Color: Black (Standard), Beige or Custom Drive Bays: 4x 3.5"HDD Power Supply: Dual 1U 150~300W ATX P/S (Rear Installation) W=80mm, D=150mm Cooling Units: 4x (80mm = 42.5CFM ea.) Fans Expansion Slot: 2 PCI Slot Connector Port (front): 4x USB Ports Buttons: Power ON/OFF, System Reset Each Front Door(s): Single Door With 2 Thumbscrews (Removable) Dimensions(W x H x D): 483 x 88 x 356mm (19"x 3.5" x14")Circotech