The SR42UB features a massive front-to rear-ventilation capacity that meets or exceeds server manufacturer requirements. Its integrated baying tabs make it easy to combine multiple enclosures in rows for data center applications. This enclosure is also compatible with hot-aisle/cold-aisle configurations. The SR42UB houses 3000 lb of standard 19-inch rack equipment in 42U. Its front & rear pairs of vertical rails have square mounting holes that are adjustable in quarter-inch increments from 4 to 42 inches. Adjustment is quick & an easy-view depth index ensures consistent rail placement without requiring time-consuming measurements. Each rack space within the enclosure is numbered for ready reference. Two of the adjustable vertical mounting rails support toolless button-mount 0U installation of up to four compatible PDUs & cable managers. This feature makes it easier to route cabling to rack equipment & reduces cord clutter. With its locking, reversible, removable front & rear doors, & locking, removable side panels, the SR42UB provides ultimate equipment safety. The side panels are half size for ease of removal & reinstallation.