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Old 12-22-2019, 10:25 PM
TinMan TinMan is offline
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Join Date: Sep 2006
Posts: 2,800
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I have had to have the treatment on two houses that I have had. They use a positive ventilation fan system to extract the air/gases under the foundation, and route the gases through a wall and up out the to outside using 3" PVC pipe. The fan runs 24/7. It is expensive. Most realty/house purchase inspections require it in many locations any more.
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