RM42300 4U 17.5" Compact Industrial Server Chassis Equipped with truly isolated anti-vibration cage, dust-proof filter, and its compact size make it ideal for space-sensitive industrial applications. Features: Supports M/B up to 12” x 9.6” Available for rackmount and stand-alone installation Dedicated 80 mm fan for HDD cooling Truly isolated anti-vibration design on internal HDD and drive cages Card retainer to hold low profile and full height add-on cards Front 120mm fan with filter for add-on card cooling Optional second 3 x 5.25” drive cage for maximum configuration flexibility Supports 1-door or 2-door front bezel configuration Supports PS/2 single or mini-redundant PSU Specifications: Form Factor 4U MB ATX (12” x 9.6”) Dimensions (D x W x H) 445 x 430 x 176 (mm)17.5” x 16.9” x 6.9” Drive Bays External 3.5"：1 External 5.25"：3 Internal 3.5"：4 Slim ODD：1 Power Supply PS/2 Single or Mini-redundant Indicators 1 x Power Status1 x HDD Activity2 x LAN Activity Front Control 1 x Power On/Off1 x System Reset2 x USB 3.0 System Security Intrusion Switch, Key lock on front door Cooling Fans Front: 1 x 120mm (T=25mm), PWMRear: 2 x 80mm (T=25mm) (Option) Expansion Slots 7 Storage Backplane N/A Net Weight 9.5kg Gross Weight 12.3kg Front Bezel Option Cubic Feet 3.44 Container Loading (Single Packing) 20’: 288, 40’: 598, 40’H: 678