A heat exchanger kit useful for installation in an existing or new electrical equipment cabinet. The heat exchanger has a first air flow path for air drawn from the exterior of said cabinet and a second air flow path from the interior of said cabinet, where the first and second air flow paths are perpendicular to one another and are substantially isolated from each other; and further including at least one fan for circulating air through at least one of a first and a second air flow paths. On new cabinet installation the heat exchanger may be mounted on any surface.
