19" Wall Mount 4-Post Open Frame Network Rack, 9UHinged open frame enclosure wall rack for network and server equipment The 9U 19" Wall Mount 4 Post Open Frame Network Rack from Intellinet Network Solutions is a simple, cost effective way to house IT equipment in secure environments that don't require a lockable rack solution. It's a great fit in places where small rack solutions are often dispersed throughout an organization, like at a remote location or branch office. Its relatively compact design