An adapter for a vent system for a cargo container having corrugated panels, has a base portion formed of sheet material, having an outer boundary and an inner boundary, the inner boundary enclosing an area sufficient to accommodate a twelve-inch diameter circle, the base portion shaped to closely conform to geometry of the corrugated panels of the cargo container, an intermediate portion joined in an airtight manner to the inner boundary of the base portion, presenting a surface at a height above an upper extremity of the corrugated geometry of the base portion, and an interface providing a through opening in the surface of the intermediate portion within the area enclosed by the inner boundary of the base portion.

A container module and a functional unit which can reduce the width of a transport container are provided. A container module includes a transport container and a plurality of functional units accommodated in the transport container, wherein the functional units are disposed in an array in the transport container. All the heights of the plurality of functional units are greater than their widths in a direction in which the functional units are arrayed. Also, the functional unit is used in such a manner that a plurality of the functional units are disposed at predetermined positions in an array, and the height of the functional unit is greater than the width of the functional unit in a lateral direction in which the functional units disposed at the predetermined positions are arrayed.