3M Filtrete Allergen Defense Furnace Filter The Filtrete Micro Allergen Reduction Filter attracts and captures microscopic particles like lint, dust mite debris, pet dander, smoke and smog and large allergens like mold spores and pollen from the air passing through the filter. Designed with Filtrete Brand 3-in-1 technology to pull in and trap unwanted air particles wile letting clean air flow through. Outperforms fiberglass, washable and non-electrostatic pleated 1 In. filters. Lasts up to 3 months. For residential use only. Red label. The Filtrete Micro Allergen Reduction Filter attracts and captures microscopic particles like lint, dust mite debris, pet dander, smoke and smog and large allergens like mold spores and pollen from the air passing through the filter. Designed with Filtrete Brand 3-in-1 technology to pull in and trap unwanted air particles wile letting clean air flow through. Outperforms fiberglass, washable and non-electrostatic pleated 1 In. filters. Lasts up to 3 months. For residential use only. Red label.