Do it Efficiency Rated Allergen Plus Furnace Filter, 20 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 high-performance filter is designed to remove microscopic particles that can stain walls and furnishings while alleviating seasonal allergies. It effectively protects against common allergens such as ragweed pollen, mold spores, dust mite debris, pet dander, and dust/lint. The filter features low airflow resistance, which helps save on energy costs while ensuring your furnace and air conditioning units remain protected. With a lifespan of up to 90 days, this filter provides long-lasting clean air for your home. The product is identified by a blue label for easy recognition. Model Number: 474290