TELECT's 12300KW201 23 in x 7 ft seismic UEF rack. 43RU. Closed duct. No top angle. black. Installed with Teletect's seismic anchor kit. EIA hole spacing. Guard box location on narrow or wide flange. TELECT's Unequal Flange racks feature a two-post narrow-rail steel design to support rack-mounted equipment in all standard types of network applications.