An ancient Roman underfloor heating system called hypocaust was utilized to provide hot air to buildings. In his writings from the end of the first century BC, the Roman architect Vitruvius credits Sergius Orata with their invention. There are several Roman hypocaust remnants that can be found in northern Africa, western Asia, and Europe. The hypocaust was a precursor to contemporary central heating and an invention that enhanced public health and living circumstances. Hot baths, or thermae, as well as homes and other structures, both public and private, were heated using hypocausts. The pilae stacks, or pillars, raised the floor above the ground, with a layer of tiles, concrete, and then more tiles on top. Spaces were left inside the walls to allow hot air and smoke from the furnace to escape through these closed spaces and out of roof flues, heating the interior of the room without contaminating it. #History#Architecture
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