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OndolOndol is a traditional Korean underfloor heating system, similar in principle to a Roman hypocaust. The main components are a fireplace or stove (also used for cooking) located below floor level, a heated floor underlayed by horizontal smoke passages, and a vertical chimney to provide a draft. The heated floor is supported by stone piers, covered by stone slabs, clay and an impervious layer such as paper and pine pitch. The latter gave the floor a warm yellow color which is still popular in modern homes. The Ondol was typically used as a sitting and sleeping area, with warmer spots reserved for honored guests. Problems with the Ondol included overheating, which could persist for hours due to the heavy mass of masonry, and carbon monoxide poisoning from cracks in the floor surface. For these reasons most modern residences in Korea have Ondols heated by circulating hot water, or electrical cable.
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