Many builders feel that if they include a radon mitigation system (passive or active) in their new homes it draws attention to radon and may make potential buyers think the house must have had a serious radon problem if it was bad enough for the builder to put in a mitigation system. As backward as that thinking is it is pretty common.

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"Baseball is like church. Many attend but few understand." Leo Durocher
Bruce Breedlove
www.avaloninspection.com