Corrugated air return bulkhead

In combination with a container for storage and shipment of temperature controlled materials and wherein said container includes an airflow heat exchanger assembly mounted on a upper portion of one wall of said container and said heat exchanger assembly includes a central downwardly opening air inlet, a pair of upper opposite side horizontally and oppositely outwardly opening side air inlets and a central upper temperature conditioned air outlet, an air return bulkhead including upstanding opposite side marginal edges and top and bottom marginal edges and mounted on said one wall defining, in conjunction with said one wall, an upstanding return airflow path between said one wall and said bulkhead bounded by said side marginal edges and including a central portion and opposite side wall portions, the central portion of the upper end of said return airflow path being registered with said central downwardly opening air inlet, upper opposite side extensions for said bulkhead vertically adjustable relative thereto and defining open ended horizontal flow paths above said top marginal edge and into which the opposite side portions of said upper end of said air return flow path open, the remote ends of said horizontal flow paths opening outwardly along said one wall and the adjacent ends of said horizontal flows paths being registered with said side air inlets, a plurality of vertically spaced horizontal mounting bars secured to said front wall, said bulkhead including vertically extending laterally spaced corrugations formed in at least the lower portion thereof with portions of said corrugations abutted against said one wall, said portions of said corrugations including a plurality of vertically spaced sets of horizontally spaced and aligned notches formed therein in which longitudinally spaced portions of said bars are received, the notched portions of said corrugations being removably secured to said bars.