My purpose in providing this link is not just to make a buck. But to provide good information to all of us, who come "hades" or high water will go ahead and do-it ourselves anyway! The web can be a wonderful place full of good and helpful knowledge, but it also can be fraught with much misinformation as well. So my intent is to help those who insist on DIY to get it right the first time. http://www.indoor-air-health-advisor.com/do-it-yourself-radon-mitigation.html Best Regards, Val PS. You will also find lots of useful info regarding IAQ issues here as well.