The SRCOOLMVKIT SmartRack reg; Magnetic Vinyl Kit consists of six panels that attach magnetically to the vented front door, rear door or side panel of your floor or wall-mount rack enclosure. By blocking perforated areas, cool air is trapped inside the rack cabinet, and hot spots that can damage connected equipment are eliminated. Operating at a cooler temperature allows your sensitive rack equipment to last longer and work more efficiently. With four 16.9 x 18.8-inch and two 16.9 x 5.2-inch magnetic vinyl panels, the SRCOOLMVKIT can cover an EIA-standard 19-inch 48U rack door perforation pattern. It is compatible with all SmartRack enclosures.