This definition appears somewhat frequently
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Samples in periodicals archive:
A server cabinet manufacturer, in testing, successfully rejected 20kW per rack with its cold aisle containment system, using a server inlet temperature of 65 degrees, Delta T across the servers of 45 degrees F, and 65% perforated floor tiles. A case study at the 2008 Silicon Valley Leadership Group, entitled Air Flow Management, advocated containment as a viable high density solution but stopped short of giving a range of cooling capacities.
Secondary spill containment system for use on pallet racks