Energy efficient furnaces for jewelry and ceramic. The firing chamber is a one piece ceramic fiber shell with embedded elements. For greater thermal efficiency the space between the steel case and the fiber shell is packed with extra fiber insulation. The door seals tightly with a heavy spring latch. All the controls are located in the base. Reaches 1000 °F (538 °C) in 30 minutes. Firing chamber 13” X13” X 9” Ht. Pyrometer is not included.