42U enclosure includes doors and side panels. It is designed for secure, high density server and networking applications in IT environments. Its front and rear pairs of vertical rails have threaded 10 to 32 mounting holes that are adjustable in quarter-inch increments from 4 to 27-inch. It is designed with provisions to integrate cooling, power distribution and cable management, SmartRack enclosures make ideal homes for mission-critical equipment. It is compatible with all standard 19-inch rack equipment. Adjustable mounting rails include an easy-view depth index to eliminate time-consuming measurements. Lightweight modular doors and side panels provide safe, convenient service access. Integrated baying tabs facilitate combining enclosures in rows for standard data center baying applications.