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air exerts pressure I know the answer to this question because I used to be a sign painter and also paint banners.
The holes are to prevent the wind from blowing the sign , banner or hoarding down...so the wind goes though it.
There's actually a law that states how many holes must be present --depending on the size of the banner/hoarding/sign.
It's for safety and insurance purposes...to prevent people from getting hurt.Even if the banner--which is light fabric...were to blow--say onto a freeway or road...it could cause a traffic accident...so see what I mean?
That's why there's the holes.

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Candido Kohler

Lvl 10
3y ago

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