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Blowing air into a confined space doesn't really work well. It's the same reason why pointing a fan into a hot room doesn't cool it down any; the air needs somewhere to flow to, and it can't go out the way it came in because there's a fan pushing it back. So the air in the room might move around a bit, but it isn't circulating hardly any of the air from the rest of your house, which is why that room stays warm even though you "feel" the wind from the fan. But if you open some windows in the house and do the same thing, you now have place for the air to move to, so it doesn't just spin around the same container any longer.