that specifically depends on the difference in pressure between area where the flow is versus the area being covered by the perforated panels, as well as on air speed and the size of the perforations.
I however am far from an expert on the matter.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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