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I'd speculate that a perforated floor would have flow into the cabin in some areas AND out of the cabin in some areas AND flow "along" the floor... too much going on. At any rate I think that the flow would be disrupted by the perforations in whatever axis... vs say a perforated grille block which is pretty much just oncoming (perpendicular) flow, and when the oncoming velocity gets high enough the mesh starts to behave as a solid with much of the air simply going around it because that is easier than going through it...
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