Excel 542-021-BK Modem/Cantilever Vented Shelf 2U 400mm BlackCantilever Shelves can be used to support both active and non active data equipment within the rack that is none 19" rack mountable, these shelves are fitted to the front 19" profiles using M6 hardware and are vented which allows for air circulation around the equipment. This shelf is commonly deployed in wall racks but can also be used in floor sanding racks, universal fitting allows them to be used in a wide range of racks. The shelf allows for