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					Originally Posted by  Hugh
					 
				 
				Not in the UK, they weren't - they were just a cheap method used by builders to cut costs, but to sell the house with "central heating" (my first bought house (in Thatcham in ‘84) had that system; all it was was a column in the centre of the house distributing warm air thru vents at floor level in each connected. 
 
Terrible system. 
			
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 And dangerous, when old and rickety, as my dad found out a year or two after buying a house in the late 80s that had one of these.  The air pump started to overheat and smoke thanks to a build up of debris, and it blew the smoke round the entire house in double quick time.  Thankfully the smoke alarm (for back then it was common only to have one, if you had one at all) was powered up and working.