The IBM® Rear Door Heat eXchanger for the iDataPlex® Rack is a water-cooled door that is mounted on the rear of the iDataPlex rack to eliminate the heat exhaust that is produced by the devices in the rack. The heat exchanger is 1200 mm (47.24 in.) wide by 120 mm (4.72 in.) deep by 2000 mm (78.7 in.) tall.