Radon testing is an additional test .
Robert Drennan is a Certified Radon Measurement Specialist. We are listed with the National Radon Safety Board. NRSB is an independent agency assigned by the Federal EPA to examine, regulate and certify Radon professionals. A special filter in the chamber wall allows for the free movement of radon gas but prevents the entry of radon decay products. Based on principles of gas diffusion, the concentration of gas in the chamber will be equivalent to the concentration of radon gas in the air.