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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 mberger on Monday May 28, 2018 @10:13AM (#17172499)
TIL about mmH2O. Is this common in HVAC? I thought pressure was mostly in mmHg or bars(millibars).
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Re:Ask HN: Do I place the fan so that it blows air inwards o... by Cerium on Monday May 28, 2018 @10:35AM (#17172622)
Yes, fans usually have a specification on the pressure they can create in inches of water or millimeters of water.

I think it is because you can measure it yourself with just a tube and water- open end manometer.

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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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