Top options accept 4-1/2-inch, low-profile 6-inch or 10-inch fans for Active thermal management. Vented pagoda tops maintain enclosure temperatures through natural convection while minimizing the amount of dust and debris that can fall into the rack, and adds 1-1/2-inch to the top of the rack. Solid, slot pattern vented, vented and cable ladder adapter tops also available. All tops (excluding MV-PVT and MW-LA) include a removable two space service plate. Allows removal of top without disrupting cable bundles.