The Hyprotherm, Top Loading, Forced Air (Coal or Wood) series is a new concept based on our Chest Loading series. All of these top loading furnaces come with easy opening, gas spring assisted fuel doors. They have 3/8” thick fireboxes which set vertically inside the air jacket. This allows for the Top Loading fuel door and an economical complete burning fire. The air jacket is 1/8” steel top, bottom and sides. They have cast iron shaker grates and are designed to burn coal or wood. They have removable ash pans to make ash removal simple. Each furnace is pre wired with only one connection to a power supply and one connection to your home thermostat necessary, making them basically plug and play simple.