What is the recommended testing distance from the ceiling during radon testing?

The recommended testing distance from the ceiling during radon testing is commonly set at 12 inches. This guideline helps ensure that the radon levels measured in the home reflect a realistic assessment of potential exposure for occupants. Positioning the test device at this height allows it to capture air that is representative of the breathing zone, which is crucial for accurate measurements.

Testing too close to the ceiling can lead to skewed results due to variations in radon concentration that may occur closer to the foundation or floor level, where radon typically enters the home. Additionally, factors like air movement and stratification can influence radon levels, making 12 inches a preferred protocol to account for these variables and to ensure that the assessment aligns with the guidelines set by health and environmental organizations.