The newer 12V Dometic/Atwood DC Medium Furnaces take the place of previous 8500 Series and are available in models from 16,000-34,000 BTU. Furnace dimensions: 7-3/8”H x 16-1/2”W x 20”D. May be mounted vertically or horizontally. Access door and thermostat sold separately. NOTE: the new Medium Furnace is slightly deeper than the previous 8500 Series, therefore, please ensure the existing cutout will accommodate the new model. Available from 16,000-35,000 BTU.