Server

Open frame rack; an open frame with mounting rails, but no sides or doors. It is typically used for applications where the rack does not need to control airflow or provide physical security. Open frame racks are good for network wiring closets and distribution frame applications that have high-density cabling because they provide easy access and plenty of open space for cable management. Open frame racks can have two or four vertical mounting rails (called “posts”).

Rack enclosure; this type of rack has removable front and rear doors, removable side panels, and four adjustable vertical mounting rails (posts). It is also called a rack cabinet. The front and rear doors are usually vented to encourage adequate airflow from front to back, through the installed equipment. Rack enclosures are ideal for applications that require heavier equipment loads, hotter equipment, and higher wattage per rack. Because the doors and side panels lock, they also provide physical equipment security at the rack level (as opposed to the room level).

Wall-mounted racks; These racks are designed to be mounted to a wall, saving floor space and installed in areas where other racks cannot be installed. They can be either open-frame racks or enclosed cabinets. They are usually smaller than their floor-standing counterparts and cannot support as much weight. Cabinets can be adapted to floor-standing applications by adding rolling casters.