This furnace, found in Wolji in 1975, has both a fireplace compartment and a pipe attachment to vent smoke. The furnace was also used for cooking, as evidenced by the two holes on the top, which allowed two different dishes to be cooked simultaneously. A clay band was laid along the holes to prevent heat from escaping. Designs of flying birds are stamped along the upper ridge of the furnace, while the middle section is stippled with dotted lines. The interior of the furnace retains some smoke residue, proving that this furnace was actually used. In fact, many of the artifacts excavated from Wolji were used in the palace. Such materials are essential for studying the lifestyle of that time, as well as for determining the historical timeline.