radon retest after repair 5
https://fair-wiki.win/index.php/What_You_Need_to_Know_About_Radon_in_Basement_Testing_and_Mitigation
After you've had radon mitigation work done, a retest is strongly recommended to confirm your system is working. Usually you wait at least 90 days, then you place test kits in the lowest livable area for a minimum of 48 hours. This step matters because the new setup might need adjustments, and you want to be sure your family's exposure is truly reduced to a safe level. Also, keep windows and doors closed as much as possible during the test—your test report will be much more reliable. Getting th…