- 2U rackmount design, meets EIARS-310C standard. - 2 x 5.25' drive bay, 6 x 3.5' drive bays - Support EEB (12' x 13'), CEB(12' x 10.5'), ATX (12' x 9.6'), Micro ATX (9.6' x 9.6') motherboard - 4 x 80mm ball bearing middle fans wall for better ventil