The rack is a function that allows you to grill food within your oven cavity. The rack element is located on top of the oven roof. It is thermostatically controlled, meaning it will maintain regular heat and a consistent oven temperature for optimal results. I The middle zone is a go-to for many of your baking needs and is typically a safe bet for casseroles and baked goods. The bottom zone of the oven is often good for roasting and baking crusty bread or pizza, while the top is ideal for broiling and toasting.