Buy 3M Filtrete 1700 Air Filter Best Quality 20" x 20" x 1", Ultra Allergen Filtrete Filter, 3 Month Filter Is 90% Effective At Capturing Large Allergens Like Mold Spores & Pet Dander, Captures Microscopic Allergens Like Dust, Smoke & Smog, Captures Bacteria & Particles That Can Carry Viruses, Meets The Guidelines Of The American Lung Association Health House Program., Brand 3M50-Percentage better small particle filtration than our 1000 performance level filterLasts up to 3 months90-Percentage effective at capturing particles like dust, pollen and mold spores from the air passing through the filterCarries a 1500 microparticle performance rating (mpr)Attracts and captures microscopic particles that can carry bacteria and viruses
I can only say that the HVAC service man must like them. In his semi-annual calls he always comes down from the crawl space and says he used the 3M filter I left for him instead of the one he brought: "Your...
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