To follow are the steps to follow, before and during a radon measurement by Northern Illinois Radon LLC to properly prepare a building for a closed-building radon measurement.


Following these guidelines are important to assure measurement  accuracy.  Should there be any questions or concerns please contact Northern Illinois Radon LLC for answers and solutions.


1.  Keep exterior doors and windows for 12 hours prior to the start of this test, the continual use of exterior doors for normal entry and exit is allowed and expected.  Keep all windows, doors and other openings to the outside closed during the testing period.


2.  Set the thermostat to 72 Degrees Fahrenheit (plus or minus 5 degrees Fahrenheit) and set to "Auto".  Do not change the testing environment in any way, including but not limited to, opening windows, leaving doors open, changing thermostat or fan settings or cause outside air to be introduced into the home.


3.  Operation of mechanical systems that draw air out of building may adversely affect the test results.Any test device(s) placed should not be disturbed and the location should not be changed.  Report to Northern Illinois Radon LLC any circumstances or events that may cause the conditions outlined above to be violated in any way or manner, and any circumstance that may have an influence of the testing conditions or results.  If any of these guidelines are not followed and the test results appear to be incorrect, a re-test may be required.


4.  When the radon monitors are placed and test is started, tamper evident seals will be installed on all windows. These should not be removed until the measurement is concluded.


5.  Forty-eight (48) hours after the start of the radon measurement, the measurement will conclude and you will have (verbal) results at time of monitor retrieval.  A formal report will be prepared within 24 hours and delivered electronically (email, fax) and by mail (upon request).