Do it Efficiency Rated Allergen Plus Furnace Filter, 10 x 20 x 1 in. superior air filtration with its MERV 8 efficiency rating, making it 15 times more effective than standard fiberglass filters. This furnace filter is designed to remove microscopic particles that can stain walls and furnishings while helping to alleviate seasonal allergies. It effectively protects against common allergens such as ragweed pollen, mold spores, dust mite debris, pet dander, and dust or lint. The filter features low airflow resistance, which helps reduce energy costs while still providing strong protection for your furnace and air conditioning units. It is designed to last up to 90 days and is easily identifiable by its blue label. Model Number: 447994