Filtrete 3M 3-Pack 1200 Dust And Pollen Allergen Reduction Filter 20 x 20 x 1 Outperforms non-electrostatic filters electrostatically charged fibers attract microscopic particles like smoke, pet dander, household dust, smog Non-electrostatic filter means 3-month pleated, washable and ordinary fiberglass 3-pack filters attracts and captures large allergens like pollen, mold spores, dust mite debris, lint