Alen (BF25A HEPA-Fresh Replacement Filter for A350 and A375 Air Purifiers, 1-Pack Creates an allergy and asthma friendly environment by removing dust, pet dander, mold spores and pollen from the air Provides pure, breathable air by capturing VOCs (Volatile Organic Compounds) from cleaning products, personal care items and other household materials Helps maintain a clean household by reducing dust Pre-Filter layer extends the life of the filter Eligible for Alen's convenient Auto Ship Filter Plan with FREE Lifetime Shipping