Hi.
There is a false back. That is how the airflow gets where it is supposed to. The doors have rubber gaskets on them ensuring an airtight seal. They might be as much as 30cm deep though. Cannot say for sure.
Interesting video. Yes, same principle, but way too small heat sinks. It is the length that is the secret I believe. My unit switches about every 50 second. Also, having the input/output vents beside each other will give you a bit of air just looping and coming back in.
-Ko_deZ-
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