It is unfortunate that a good option for some is not the same for others. I am in a low radon area and my tube runs(two) will be straight downgrade so only a small weep hole will needed. Areas with radon issues will effect the needed fresh air demand if one wants a warm basement space. For me at my age the exposure to all the "bad" things are long done. We played with liquid mercury, asbestos was everywhere and lead was in half the game we ate for dinner if it wasn't fish.
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