Warm air rises, cool air falls, so we have the fan draw the hot air down in winter and the hot air up in summer, I really don't think it makes that much difference as long as you have the air circulating. We use our "fireplace" in the winter and find that the hot air stays in the living room (front living room) so we use the fan to move the heat down. I doubt that we would see much difference regardless of the direction of the fan movement.
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