A data processing equipment structure includes a plurality of sidewalls and a ceiling panel, which, together, define an enclosed space. The structure further includes at least one equipment enclosure and at least one cooling unit arranged in side-to-side relationship in a row within the enclosed space. At least one separation panel divides the enclosed space into a front plenum at a front side of the row and a rear plenum at a rear side of the row. Cool air in the front plenum is isolated from heated exhaust air in the rear plenum.