Before installing system components, locate the hole pattern in the rack rails to allow adequate Unit height (U) of vertical space. Rack cabinets that meet EIA-310 standards have an alternating pattern of three holes per rack unit. For the front and back vertical rails, the center-to-center hole. If you are selecting an enclosed cabinet, we recommend one of the thermally validated types listed above: standard perforated or solid-walled with a fan tray. Therefore, it is important to understand the different options, their pros and cons, and when they should be used. Needs to be bolted to floor and/or anchored to a wall (preferably both). Most suitable for shorter depth devices - typically network gear / patch panels. Standard brackets are included with the switch.