A data center row infrastructure module enables rapid deployment of a computing room enclosure for computer systems that provides intake air circulation to, and exhaust air removal from, the computer systems in the enclosure. The data center row infrastructure module includes free-standing exhaust plenum structures encompassing opposite sides of the enclosure and a plenum module spanning a top end of the enclosure between the free-standing exhaust plenum structures. Each free-standing exhaust plenum structure includes an internal exhaust air plenum that directs exhaust air received from the enclosure through an exhaust air outlet on a top end of the free-standing exhaust plenum structure. The plenum module establishes a bottom end of a cooling air plenum above and separate from the enclosure and between the free-standing exhaust plenum structures. Some plenum modules can direct cooling air directly to the enclosure as intake air. Some plenum modules can mix cooling air with recirculated exhaust to provide the intake air.