I would think that any filtration system that kept sand and dirt out would have pores so small as to inhibit the flow of air, and I'm sure you want good air flow. Using a good non-pleated paper filter will most likely eliminate a lot of what you are wanting to keep out. Cut it to fit your screens and velcro it in place. you may need to do several windows to get the desired amout of fresh air. Pull the filters off when you are not opening windows.
That's my best suggestion.
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Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS
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