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ps. mike said "I think, looking at it, it probably only lets through 10% ? (Im guessing, but Id say 10% would be an "at best") "
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The smallest mesh available on McMaster's website is 18.4% open area. The holes are 0.0007 inches wide, it has 635 openings per inch and is sickly expensive (~$750/sq. ft.). It seems to be made for a very small particle sieve. Looking at the picture you provided with measurements of your stock grill your mesh seems to be 18 openings per inch which depending on the wire size would put it at 40 - 50% open area.