One aspect of this disclosure is directed to a sub-rack module for supporting a personal computer chassis therein. The sub-rack module is configured to be received within a multi-position support rack. Due to the unique combination of the sub-rack and the multi-position support rack, the sub-rack modules can be positioned such that the back ends of the personal computer chassis form an air passageway in the center of the multi-position support rack, which allows for the air flow to be directed through the passageway and out through the front end of the personal computer chassis. This configuration allows for the high density storage of an array of personal computer chassis while providing adequate cooling for multiple units. A method for manufacturing this system is also provided.