
A partitioning section comprising two metal side walls and a rigid corrugated board of a heat insulating material which is interposed between the side walls so as to hold them apart and out of contact and which is secured to the side walls by adhesive to form an integral assembly. The side walls have at one side edge of the section inturned flanges which are disposed in spaced parallel planes perpendicular to the walls and are each of a width less than one half of the thickness of the section. T...











