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Archived from the original on 17 May 2013

These chambers are specifically designed to facilitate the flow of heated air

The EPA also recommends using a professional radon contractor that meets these set of requirements: Implements radon testing before designing or installing a mitigation system Installation of a warning device to warn you if the system fails Post-installation testing for verification that radon levels have been reduced State certification, professional proficiency, or other acceptable certification Bonded and insured State and/or local licensing if required These items should be included in any proposal or contract along with a guarantee that the mitigation system will reduce radon levels to below 4 pCi/L

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