Fortify 20x25x5 MERV 11 Replacement for Lennox X6673, X6661 HVAC Furnace Filter. (2-Pack) Actual Size: 19.7 x 24.7 x 4.38

Actual Filter Size: 19.7 x 24.7 x 4.38 | Nominal Size: 20 x 25 x 5 | Recommended to replace every 6–12 months depending on usage and environment. Replacement for Lennox X6673, X6661: Designed to match the performance and fit of the Lennox Healthy Climate X6673, X6661 filters. Fortify provides dependable filtration for whole-house HVAC systems. High-Efficiency MERV 11 Filtration: Captures up to 95% of airborne particles including dust, mold spores, pet dander, pollen, and household allergens—helping create a healthier indoor environment. Durable Construction for Long-Term Use: Made in the USA with electrostatically charged synthetic media, moisture-resistant frames, and reinforced metal backing to withstand humidity and airflow stress. Improves System Efficiency: Deep pleated design delivers low airflow resistance and high dust-holding capacity, helping HVAC systems run cleaner and more efficiently for longer.