Actual filter dimensions: 19.7" x 24.7" x 4.38"
Recommended replacement cycle: Every 6–12 months
Pack includes: 2 filters
✅ Direct Replacement for Lennox X6670
Designed to match the performance and fit of the Lennox Healthy Climate X6673 and 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.
✅ Actual Filter Size for Accurate Fit
Each filter measures approximately 19.7" x 24.7" x 4.38". Pack includes two filters. Replace every 6–12 months depending on usage and environment.
