Two independent cooling systems provide a dedicated refrigeration unit to help keep food fresh longer, and a separate system for frozen food. The FreshFlow Air Filter helps minimize odors while the FreshFlow Produce Preserver helps delay over-ripening. This installation guarantee ensures KitchenAid Brand Built-in Refrigerators will replace your existing cabinet cut-out of a standard comparable built-in refrigerator model that is 36", 42" or 48" inch wide or kitchenAid will provide up to $300 for a professional to adjust your cabinets 1 .