The difference between spring and winter kang burning, spring kang burning how to pour smoke?

The kang is the northern people's "warm bed". Although most of the urban buildings in the north do not have kangs, but only beds, but the kang appeared much earlier than the bed. Zhang Guoqing, in his article "The Origin of the Custom of Northern People's Warming Kang", proved that the New Book of the Tang Dynasty (新唐书-高丽传) contained the following statement: "[The people of Goguryeo made long kangs in the winter months, with warm fires burning underneath them". Accordingly, it was concluded that the Goguryeo people invented the kang. In fact, however, the idea that the Chinese kang originated in Goguryeo is wrong, and the kang was invented by our Han Chinese. According to archaeological discoveries, the Dongheishan site in Dongheishan Village, Xushui County, Baoding City, has a total area of about 1.5 million square meters. The site is rich in connotations since the Warring States, the two Han Dynasty, the Tang and Song Dynasty until the Ming and Qing Dynasties. This Dongheishan site found in the kang, its age can be as early as the Western Han Dynasty early, middle, the origin of the kang in China more than a thousand years ahead of the history of the origin of the kang, for the origin of the kang research provides new materials.