The Excalibur 8500 IV series furnace was redesigned to be more efficient and quieter. 12V DC, 5.6 Amp furnace utilizes space with either a horizontal or vertical installation. It measures 16-1/2 inch width x 7-3/8 inch height x 18 inch depth and weighs 30 pounds. Includes direct spark ignition (DSI) and a vent assembly. Access door & thermostat are sold separately.