Refrigeration units for integral containers are available from various manufacturers. The width and height of the units are defined as well as the arrangement of the screws for fastening the unit inside the container. In principle, only the depth of the unit is variable, although all manufacturers are endeavoring to design the devices to be as flat as possible, so as to retain as much usable loading space in the container as possible. Today, there are two main major manufacturers on the market in addition to a number of smaller companies who often only manufacture small series of special units, for instance for refrigerated tank containers.
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