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A comment on Ask HN: Do I place the fan so that it blows air inwards or outwards?. Parent comment

Re:Ask HN: Do I place the fan so that it blows air inwards o... by raldi on Monday May 28, 2018 @10:47AM (#17172676)
How?
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Re:Ask HN: Do I place the fan so that it blows air inwards o... by masklinn on Monday May 28, 2018 @11:19AM (#17172880)
Put bottom end of tube in water, put fan at top of tube drawing out, turn fan on, see how much the water climbs inside the tube?
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