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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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Air exchange.
Radon is a gas that that comes in through the ground due to the lower partial pressure of a heated space.
SO perhaps a HVAC system that pushes positive pressure on the house. (?)
That's all I know. Never had to deal with it.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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