The Reefer is probably a "plug and play" unit with a lot of self-contained systems, requiring only power to function. In the context of this story, a reefer is an ice-box or ice-coffin for preserving a living person for a long voyage. There are often fans to increase airflow over both. The motor runs a compressor which is connected to an evaporator and condenser. Trucks also have power ports to run the motor. what you mention about a small airgap around is not relevant to how the 'fridge gear works. quite simply the reefer equipment, fan etc is on that open end. This is charged as an additional cost when booking space on a vessel. alephzero - there is a HUGE gap (like four feet) between each length-wise row of containers. The white ones have a motor pack visible on the end, which are connected to an all-weather power socket. Here are some stacked reefers, mixed in with regular shipping containers (also known as "sea cans") The motor is outside the storage space, its in a separate protected area at one end of the container. A nominal "20 foot container" or TEU will have slightly less internal capacity when it is refrigerated compared to a normal sized container due to insulation and motor. The bodywork is lined with extra insulation, and there may be humidity control systems to protect the contents. Items like fruits need to be chilled to perhaps +4 degrees C, and not frozen. REEFER is a contraction of "Refrigerated Container" and will keep the contents at a pre-configured temperature, often -18 degrees C for "deep frozen" items like meats.
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