An ondol, also called gudeul, in Korean traditional architecture, is underfloor heating which uses direct heat transfer from wood smoke to the underside of a thick masonry floor. In modern usage it refers to any type of underfloor heating, or a hotel or sleeping room in Korean style. The main components of the traditional ondol are a firebox or stove accessible from an adjoining room, a raised masonry floor underlain by horizontal smoke passages, and a vertical, freestanding chimney on the opposite exterior providing a draft. The heated floor is supported by stone piers or baffles to distribute the smoke, covered by stone slabs, clay and an impervious layer such as oiled paper. This Korean architectural element is similar to the kang bed-stove found in nearby modern-day Northeast China, historically known as Manchuria, which is used in and constructed similarily to the ondol.
The numerical value of ondol in Chaldean Numerology is: 8
The numerical value of ondol in Pythagorean Numerology is: 6