The under floor heating procedure has a long history and this goes back to the Neolithic and Neoglacial periods. The archeological dives in the Aleutian Islands and in Asia uncover how every one of the tenants drafted smoke from the flames through the trenches that were stone secured. These trenches were then exhumed in the floors of the underground homes. The hot smoke that warmed the floor stones then emanated into the living spaces too.
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