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GAP
⪢⪢
http://qindex.info/i.php?x=17609
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furnace
⪢⪢
It's a two-foot
gap
beneath the floor supported by pillars into which warm air would rush from a furnace in the corner of the room.
http://qindex.info/i.php?x=11837
○○○
gap
⪢⪢
Later hypocausts also included
gap
s between the walls so heat could flow throughout the house.
http://qindex.info/i.php?x=11839
○○○
gap
⪢⪢
http://qindex.info/i.php?x=28768
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○○○ furnace ⪢⪢
