Trendnet'S 19 Rackmount Industrial Power Supply Vertical Chassis, Model Ti-R4U, Is Designed To House Up To Four Ti-Rsp100048 Industrial Power Supplies. The Open Frame Vertical Mount Design Provides Better Heat Dissipation When Compared To Standard Closed Frame Chassis Options. Vertical Mounting Also Provides More Spacing Between Each Power Supply, Making It Easier To Install With Ample Space For Cable Management. Compatible With Industry Standard 19 Racks.