DESIGNED TO FIT: Amana, Jenn-Air, Kenmore, KitchenAid, Maytag models with a long, narrow filter installed in the fridge ceiling. NSF 42 CERTIFIED: Each Tier1 refrigerator filter is tested and certified for materials and structural integrity requirements. HIGH EFFICIENCY FILTRATION: Reduces Chlorine Taste & Odor, Rust and Corrosion, Sand Sediment, Silt, and Turbidity for 300 gallons or 6 months, depending on water usage and quality