If closed-building conditions are not met prior to a Continuous Radon Monitor (CRM) test, what is the minimum requirement for test results?

Meeting closed-building conditions is crucial for accurate radon testing as it minimizes external influences that could affect radon levels. If these conditions are not met prior to using a Continuous Radon Monitor (CRM), test results can be less reliable. The minimum requirement of 46 hours of continuous results is essential in such situations because a longer measurement period increases the reliability of the radon concentration readings.

A measurement duration of 46 hours allows time to average out short-term fluctuations in radon levels and provides a more stable indication of the radon concentration over time. This extended period helps ensure that even if the radon levels are influenced by temporary conditions, the overall outcome will likely provide a more accurate representation of the radon exposure risk.

Shorter durations, like 24 hours, might not capture enough of the variation in radon levels, leading to potentially misleading results. Meanwhile, a requirement of 72 hours isn't necessary when closed-building conditions haven't been met, as the 46-hour timeframe strives for a balance between adequate measurement and practicality. Thus, having a benchmark of 46 hours guarantees a more trustworthy assessment in unfavorable testing conditions.