Do it Efficiency Rated Allergen Plus Furnace Filter, 20 x 30 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 cause stains on walls and furnishings, as well as aggravate seasonal allergies. It provides protection against common allergens such as ragweed pollen, mold spores, dust mite debris, pet dander, and dust/lint. The filter's low airflow resistance helps reduce energy costs while ensuring your furnace and air conditioning units remain protected. With a lifespan of up to 90 days, this blue label filter is a reliable choice for maintaining cleaner air in your home. Model Number: 448044