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/diy/ - Do It Yourself

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>> No.2783256 [View]
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2783256

>>2780536
>>2780542
do your countries (states whatever) not require radon mitigation? the threshold in both states I've lived in is 4ppm with windows closed and current house was 8. A 4" pvc pipe in the foundation sump (dry) an external fan and exhaust above the roofline and it's down to next to nothing.

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