Filtrete MPR 1000 20 x 20 x 4 (4-3/8 Actual Depth) Micro Allergen Defense Deep Pleat HVAC Air Filter, Uncompromised Airflow, 2-Pack Helps protect your home by reducing allergens in your air Attracts and captures particles like household dust, lint, dust mite debris, mold spores, pollen, pet dander and smoke Electrostatically charged to attract and capture microscopic airborne particles Lasts up to 3 months Manufactured by 3M For residential use only