Is it true that whole house fans may be operated during a short-term radon test if all exterior doors and windows are closed?

Whole house fans should not be operated during a short-term radon test, even if all exterior doors and windows are closed. This is because whole house fans are designed to draw air in from outside and can significantly affect indoor air pressure and the radon concentration measurements. The purpose of a short-term radon test is to accurately measure the radon levels in a home under typical living conditions. Operating a fan can introduce external air and disturb the natural airflow dynamics, potentially resulting in misleading test results.

In radon testing protocols, it's essential to maintain certain conditions to ensure the validity of the measurements. This includes keeping windows and doors closed and avoiding any changes that could influence air exchange within the house. Therefore, the answer is that it is false that whole house fans may be operated during a short-term radon test if all exterior doors and windows are closed.