Kang has a stove mouth and a smoke mouth, and the stove mouth is used for burning wood. When the smoke and hot air generated by wood burning pass through the partition wall of the kang, the slate on it is heated to generate heat, which makes the kang generate heat. Finally, the smoke is discharged from the smoke outlet of the refractory material through the chimney. In the north of China, the stove mouth of the kang is connected with the stove, so that the kang can be heated by burning firewood, so that it is not necessary to burn the kang separately. The position of the kang near the stove mouth is called "kang head"; The position near the cigarette holder is called "Shao Kang". Generally, the "kang head" is reserved for the highest-ranking master or guest in the family, and men or young people sleep on the "kang head".
In rural areas, it is often necessary to build a fire kang to build a new house. This kang is different from a bed. It can be used for decades and cannot be easily moved or changed, so it should be built in place at one time when it is built. Before laying the fire-resistant kang, check the flue to ensure the fire-proof distance around the cooker (generally more than 370mm away from combustible materials), then determine the laying position, tamp the ground and get ready. The width of Kang is greater than 1.9 meters. The protrusion of cushion should be determined according to the depth of kang hole and the height of smoke inlet, and the slope of kang hole should be found, leveled and compacted.