From open fireplace to efficient heat source. The Jøtul C 400 Harmony is a fireplace cassette that can transform your open fireplace into a beautiful and efficient fireplace. The Jøtul C 400 Harmony has two doors that can be "folded in two". The product is designed by Hareide Design. Our cassettes fit most new fireplaces. With closed doors you can see the heat and the glass door gives a good view of the flames. In addition, it gives the security of being able to close the doors so that no sparks and embers come out in the room. *The grid depicted around the cassette is an optional accessory and is not included in the price.