What does InterNACHI recommend regarding initial measurements for non-real estate testing?

The recommendation for short-term tests under closed-building conditions stems from the objective of achieving accurate and reliable radon measurements. Closed-building conditions involve minimizing ventilation in a structure to ensure that radon levels can build up to a stable concentration that accurately reflects the actual levels present. This is particularly important for non-real estate testing, where conditions may vary significantly compared to real estate transactions.

Short-term testing allows for quicker results, which is advantageous for individuals who are conducting radon assessments outside of a real estate context—they may need to make timely decisions about mitigation or further measurement. The closed-building conditions help ensure that the radon concentration reached during the short-term test is representative of the home’s typical levels.

In contrast, long-term tests may not be practical for non-real estate situations where immediate feedback is necessary, and testing in multiple locations could complicate results without providing the focused data required for specific interventions or assessments. Therefore, focusing on short-term tests under controlled conditions provides an effective and efficient way to evaluate radon levels.