Dell added new energy efficient features to the rack enclosures used for supporting its servers and storage systems. The new PowerEdge 4220 and 2420 server rack enclosures are geared to use in any environment, ranging from wiring closets to data centers. The new racks also add 80 percent front-and-read-door perforation, aimed at improving efficiency by lowering the cold air restraint to the server. Also new in the PowerEdge 4220 and 2420 racks are flexible rear and side-rack power distribution unit (PDU) options, for easier access to power outlets within the rack.
More info: PowerEdge 4220 and 2420 (PDF)