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[–] 2 points 1 week ago (4 children)

Window fans have two sets of fan blades side by side. They can spin in opposite directions.

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  • [–] 2 points 1 week ago (3 children)
  • [–] 5 points 1 week ago (2 children)

    so that air can flow in and out of different sides of the same window, instead of having to have two windows, one with air flowing in and the other with air flowing out

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