Refrigerated containers are used for goods which need to be transported at a constant temperature above or below freezing point. To ensure adequate circulation of the cold air, the floor is provided with gratings. Pallets form an additional space between container floor and cargo, so also forming a satisfactory air flow channel. In addition, the side walls of the container are “corrugated”, which ensures satisfactory air flow there too.

In the upper area of the container, adequate space (at least 12 cm) must likewise be provided for air flow. For this purpose, during packing of the container adequate free space must be left above the cargo. The maximum load height is marked on the side walls.

To ensure vertical air flow from bottom to top, packaging must also be appropriately designed and the cargo must be sensibly stowed.