frame the cooling unit can be configured for air water or glycol use cooled air can be released through the bottom of the unit or the top of the unit in one embodiment of the invention cool air is released from the cooling unit 16 out its front face so that the air flow is from the back of the rack and out the front of the rack the cooling unit 16 can further be configured as one two or three modules in the embodiment shown in fig1 a three module cooling unit is used in the embodiment of fig1 each of row 32 and row 34 is comprised of six racks in embodiments of the invention the number of racks and the function of the equipment in the racks can vary in one embodiment of the invention the racks 18 are modified standard 19 inch racks such as those available from american power conversion corporation of west kingston r i under the trade name netshelter vx enclosures u00ae the back face of each of the power distribution unit 14 the power protection unit 12 the floor mounted cooling unit 16 and the equipment racks 18 faces the interior of the modular data center 10 or the hot room 22 essentially the back faces of the racks in row 32 face the back faces of the racks in row 34 in one embodiment the equipment racks 18 have their rear doors removed so that each rack 18 remains open to.