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Unvented crawl spaces have been gaining popularity primarily due to the push for energy conservation. One of the significant adverse side affects to the earlier types of unvented crawl spaces was a concentration of Radon gas. Scientifically installed and monitored studies from North Carolina, Louisiana, Arizona and Washington state all registered a noted rise in Radon levels with an unvented crawl space. The model homes in Arizona had to have the crawl spaces re-vented because the Radon levels rose to such a high level.