Napoleon Cast Iron Dutch Oven 4.5QT,Napoleon Cast Iron Dutch Oven 4. 5QT provides a 4. 5 Quart, Cast Iron Dutch Oven that is just right for cooking on the barbecue. Cast iron is one of the best conductors of heat, distributing and retaining it for long periods of time to ensure food stays warm. Slow cooking for large numbers is the perfect use for this accessory. Use it anywhere, on or in the oven, the barbecue, and side burners, over or directly in charcoal, and even in your fire pit.