The SR42UBMDEXP is an expansion model with a depth of 36" (927 mm) and width of 24" (600 mm). An expansion cabinet is ideal when several cabinets are bayed together. It has doors and a roof but no side panels. Its integrated baying tabs make it easy to combine multiple enclosures in rows fro data center application. The SR45UBMDEXP is also compatible with hot aisle/cold aisle configurations.