I got curious when I saw a door-less refrigerator for the first time. It was in a shop and I couldn't control myself so I began to look around to see how they work but I couldn't figure it out.
They worked well and there was nothing special about them -at least I couldn't find nothing. I couldn't also feel any notable air flow trough them. There was both horizontals and verticals. Keeping cool air in a vertical fridge is more or less like keeping water in a cubic glass that has one side removed!
I wanted to google a bit but I had no keywords for that. I tried inputs like "doorless fridges" or "no door fridges" but no good result.