Much research has been conducted into the varying designs of refrigerated contains, but essentially there are two standard types which are commonly in use today.

The first are Conair containers which are also known as Porthold refrigerated containers or simply insulated containers. These are without their own specific refrigeration facility and are dependant on streams of cool air entering the container from its surroundings. External refrigeration units therefore have to be employed with these containers and these could be permanently situated in within the ship, added to the terminal or manually attached to the required container.

The second type are commonly known as integral refrigerated containers – these do have an internal cooling system built into them which are supported by a three phrase electricity supply.

The vast majority of statistical data which refers to these types of containers makes reference to the term “TEU”. This represents “twenty foot equivalent unit” and represent a container which is 20’. It is logical therefore that the unit 2 TEUs highlights a container which is 40’ – although you should be aware that the term FEU is used to represent this.

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