Search the internet for RV air conditioner filters. Duotherm makes a HEPA replacement filter-$$. The foam screen may be purchased from many home improvement stores in bulk. I carry a SQ yard of it(well, what's remaining) in the RV.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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