Excel Environ WR600 Wall Rack Network Data Cabinet 21U 600 mm Deep GreyWB21. 6SG Excel Environ WR600 Wall Rack Network Data Cabinet 21U WxD 570 mm x 600 mm Grey, part of a huge range of Network Data Cabinets available from Mayflex. The Excel Environ WR is a range of wall mounted 570 mm wide racks designed for the installation of both cabling and equipment. The WR series of Wall Racks is available in depths of 390 mm, 500 mm and 600 mm and is suitable for multiple applications including local area networking (LAN) cabling