Leviton Extender Brackets provide an additional 2" of depth and enhanced ventilation within Leviton's Series 280 and 420 Structured Media Centers (SMCs) The Extender Brackets, which are attached between the enclosure and the cover, form a frame assembled from four 2"- deep sheet metal rails with louvers on each side. The greater depth allows for better cable management and for larger modules, such as audio amplifiers, to be mounted within the Structured Media Centers.