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As of April 1, 2019, all Canadian courses previously sold through the CERTI are now available for registration directly through Canadian National Radon Training Center (CNRTC –  

If you registered for a radon course(s) through CERTI prior to April 1, 2019, you continue to have access to those courses without interruption in your course progress.  To log in to those courses, log in as you normally would.