When conducting a radon test, what should be done with combustion air and bathroom fans?

In conducting a radon test, it is essential to follow specific guidelines to ensure accurate measurement of radon levels in a building. The correct approach is to leave combustion air and bathroom fans operating as they typically do during normal conditions, which aligns with leaving them on for testing.

When fans and combustion sources are kept operational, the radon levels can reflect the actual environment of the home, leading to a more precise and realistic measurement. This process helps assess exposure that occupants would typically experience in their daily lives.

Turning off the fans or setting them to maximum can alter the airflow and change the conditions within the home, potentially affecting the radon concentration readings. It is crucial to mimic regular living conditions during the test to provide tenants and homeowners with the most accurate radon level assessment. Therefore, allowing the fans to remain on ensures that the radon test reflects typical exposure scenarios.