Equip 19"-Server Rackmount-Chassis 4U, Rack, Server, Gray, ATX, Metal, 4U Equip 19"-Server Rackmount-Chassis 4U. Form factor: Rack, Type: Server, Product color: Gray. Front fans installed: 1x 120 mm, Rear fans diameters supported: 80 mm. Supported HDD sizes: 3.5". Width: 21.5" (545 mm), Depth: 13.6" (345 mm), Height: 12.4" (315 mm)