A HEALTHIER HOUSEHOLD – Breathe easy in your home with a Honeywell Home 4-Inch High Efficiency Air Cleaner Filter that helps keep hazardous airborne particles out and fresh air flowing in. MERV 8 RATING – Get exceptional protection against dust, viruses, bacteria, fungus, pollen, and spores. 20x more effective than typical 1-inch fiberglass filters. RECOMMENDED USE – Recommended for homes with pets, people with allergies, homes with smokers, or anyone wanting cleaner air. LONG LASTING FILTRATION – Lasts up to 12 months without losing quality over time. EASY INSTALLATION – Honeywell Home’s easy-to-install air filters make changing out your air filtration unit quick, painless, and mess-free. Actual Dimensions: 19.94 x 24.87 x 4.38 in.