What is a key requirement regarding the operation of household appliances during a radon test?

During a radon test, it is crucial that certain appliances and systems do not operate because they can significantly alter the indoor air pressure and influence the test results. The operation of whole-house fans and fireplaces can create negative pressure in the home, which may draw radon from the soil into the living space, leading to inaccurately high radon levels being measured. Therefore, ensuring these systems are not operational helps maintain stable conditions that are essential for a reliable radon measurement.

This requirement is essential for achieving an accurate assessment of radon levels, as household activities can impact the airflow and distribution of radon gas throughout the home. A clear understanding of how various appliances influence indoor air conditions can help ensure that radon testing is conducted under optimal circumstances for valid and reliable results.