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I'm pretty sure you're better off blocking the lowest grilles over the higher ones, especially if the lower ones are perpendicular to the ground... they would present a higher open area for air to flow into.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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