Filtrete Micro Allergen Defense HVAC Air Filter, Delivers Cleaner Air Throughout Your Home, Uncompromised Airflow, MPR 1000, 20 x 24 x 1, 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