Which of the following is NOT a minimum requirement for conducting a radon test with closed conditions?

Taking the test in an empty building is not a minimum requirement for conducting a radon test with closed conditions. Closed conditions refer to maintaining specific environmental factors during testing to ensure accurate results, such as keeping windows and doors closed for a certain period before and during the test.

While informing the person of required conditions, posting a notification of the testing, and ensuring that a non-interference agreement is signed all contribute to the integrity and effectiveness of the radon test, the physical state of the building—whether occupied or empty—does not inherently affect the closed conditions as long as the test is conducted properly. Therefore, a building can have occupants as long as they adhere to the necessary precautions that support the testing conditions.