Quote:
Originally Posted by stampsx2
The difference between floors is about 15%. I might be mistaken on why that exactly happens but it might have something to do with the hole under the furnace that pulls the air up and through your house.
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15% would be toward the low end of the difference, but it varies and depends on a lot of factors (type of basement, HVAC design, etc.). There isn't perfect air mixing throughout a house so generally a heavy gas entering in through the basement slab will have higher concentrations in the basement than higher storeys (most studies I've seen have ranged from 15% to 50% decrease), which is why testing is done in basements first.