Replacement KitchenAid KFFS20EYMS04 Refrigerator Air Filter - Compatible KitchenAid W10311524, AIR1 Fridge Air Filter Replacement KitchenAid KFFS20EYMS04 Refrigerator Air Filter Replaces W10311524, AIR1 Fridge Air Filter Activated carbon air filter reduces odors and freshens the air inside your refrigerator. Helps prevent odor cros-contamination of food. For best performance, replace the filter every 6 months. On Sale for a Limited Time!