What is one requirement for a home during the testing period of short-term radon tests?

The requirement for a home during the testing period of short-term radon tests is that it should have a closed ventilation system. This is critical because a closed ventilation system minimizes the exchange of indoor air with outdoor air, ensuring that the levels of radon can be accurately measured without interference from external air. By keeping windows and doors closed for 12 hours prior to and during the testing period, the conditions for the test are standardized, allowing for a more precise measurement of radon concentration in the home’s environment.

This approach is crucial because fluctuations in air exchanges can lead to misleading readings, which may not truly reflect the radon levels present in the home under normal living conditions. Other options, like well-ventilated homes, newly built homes, or older homes might not meet the controlled conditions necessary for accurate short-term radon testing, thus reducing the reliability of the test results.