Abstract: An equipment cabinet system for housing heat producing computing equipment. The system includes a rectangular shaped cabinet having an interior space defined between opposing top and bottom walls, opposing inner and outer side walls, and opposing front and rear doors. Disposed within the interior space are racks for supporting the computer equipment. The cabinet inner side wall includes an air inlet and an air outlet for air flow into and out of the cabinet interior space. A blower assembly is mounted on the front door disposed within the cabinet interior space, and an airflow directing baffle is provided on the rear door to deflect air flow horizontally towards the first air outlet. A cooling unit having an air-to-fluid heat exchanger provides cold air flow into the interior space of the cabinet and extracts heated air from the interior space of the cabinet.