Hypocausts

As well as the in situ hypocausts, a section of one has been taken to the Roman Garden and reconstructed to show how it actually works as underfloor heating. The furnace was positioned below floor level. It consisted of a small tunnel leading to an arched opening in the basement wall. The heat from the furnacepassed through the arch into the basement (hypocausis), warming the room above. The hot air was then drawn up into flues set into the walls and finally through vents in the roof. It was these flues that provided the through draught which made the system work.

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