- A Roman under-floor heating system in which hot air heated by a stoked furnace, flowed through channels, created by either raising the floor on pillars of brick and tile or cutting channels into the concrete floor and tiling over them.
- English Heritage
- http://creativecommons.org/licenses/by/3.0 (FISH Thesaurus of Monument Types)
- http://www.english-heritage.org.uk (FISH Thesaurus of Monument Types)
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