Here is one for you scientific types in the building industry. BACKGROUND: New keyed concrete poured foundation 1995. Ground consists of one great big shale that this sits directly on, clearance 0" . Basically concrete poured on the shale and yes we feel every little earthquake very well. Not a lot of surveyed radon in the area but some hot spots found by govt survey at one time or another. I did a radon test a few months after construction and it came in at around 2.00 ( if I recall th calibration correctly). At any rate it was well below any concern. Basement was sealed up pretty tight during the test period and it was winter so the boiler cycled regularly drawing its air from that area say 20' from trap. This summer I decide to test again which is advised by the experts. This time its 3.2, again below needing corrective action of any sort. This test was in summer 48 hour duration as indicated but basement was tightly closed off, nothing open. This time boiler shut down completely except for a couple cycles to heat up some DHW to shower. Like most things I like to do my tests "worst case scenario" so its not usually that closed up anyways, in fact I leave the cellar door open much of the time and at least one of the casement windows open for ventilation. OK enough baloney. I draw the air for my pellet / corn stove from the living room and have without problems for 2 seasons. I would like to put an elbow or T in the intake and draw my air from the cooler, damper air in the basement which should warm it some in the winter and draw down on the moisture content. Someone on a bulletin board did this and had these results. To do this all I have to do is drill and cut a 3" hole in the floor and drop my intake pipe. Is this something that I should back off on considering the somewhat elevated radon levels in the basement and leave it down there rather than bringing it upstairs? Plan "B": just leave well enough alone and keep the intake in the living room. What do you enlightened types say?