Do it Efficiency Rated Allergen Plus Furnace Filter, 12 x 24 x 1 in. superior air filtration with a MERV 8 efficiency rating, making it 15 times more effective than standard fiberglass filters. This HVAC air filter effectively removes 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 or lint. Designed with low airflow resistance, this filter helps save on energy costs while safeguarding your furnace and air conditioning units. It is durable and lasts up to 90 days, featuring a distinctive blue label for easy identification. Model Number: 448001