I presume its not likely. A fan that is covered my a filter or inside a protective housing. I think it is likely of very limited use but that does not always stop gadgets from selling. If the solution was easy, we would not see overheating, its one of the tradeoffs and was likely reviewed by professional video makers to see what they thought. They don't rely one a single camera or even two, so they see it differently from those hoping for a $100K cinema camera for $4K.
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