Think of it like an airplane propeller, the normal way pulls the plane forward, if they spun it the other way the plane would go backward. Which direction controls how the air feels, when it blows right down on you it has a cooling effect like standing in front of a fan. When it pulls the air up it is more like standing behind a fan, it doesn’t make you feel cooler but it still helps air to circulate and pushes warm air down the sides of the room.
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