saxonborg
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Good point I suppose the proof of the pudding is to do a test in each of those position, I have mine at the top and they are pulling slow moving air, but at the bottom the fans would be moving the air much faster with a consequent better cooling effect, maybe I should change.The fans do not have enough 'oomph' in them to pick up debris from the bottom of the vent chamber.
Logic to me suggests the opposite of what you say: if heat rises it makes sense to draw in cooler air to help it rise.
The way I see it is if you were in your house and were warm and wanted to put a desk fan on, you would stand in front of it to receive the cooling effect, not behind it.
As you say though, it is a subject of some conjecture.
Graham