1 jan 85 ano antes da era comum - Invention of heating system known as the hypocaust used in villas spread to most public baths

Descrição:

Hypocaust, in building construction, open space below a floor that is heated by gases from a fire or furnace below and that allows the passage of hot air to heat the room above. A system of central heating in a building that produces and circulates hot air below the floor of a room, and may also warm the walls with a series of pipes through which the hot air passes. This air can warm the upper floors as well.

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