Hypocaust
The Illustrated Guide to Renewable Technologies BG 1/2008, By Kevin Pennycook, published by BSRIA in March 2008, defines a hypocaust as a: ‘A space under a floor (or within the floor structure) through which heated air can pass.’
The term most possibly originated with the ancient Roman central heating system, in which and underground furnace pushed warmed air through underground tubes, which led to tile flues distributed across the floors of a building to disperse and warm the heated space to create a comfortable internal environment.
--BSRIA
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