Which of the following is a component of the ASD system's effectiveness?

The effectiveness of an Active Soil Depressurization (ASD) system heavily relies on the location of the fan. The fan's placement is crucial because it determines how effectively the system can draw radon from beneath the building and mitigate it before it enters the living space. Proper fan placement encourages optimal airflow through the system while minimizing the potential for radon accumulation. This directly impacts the overall reduction of radon levels, ensuring that the system operates efficiently to provide a safer environment.

Factors like the type of flooring, age of the building, and the color of the building exterior do not directly influence the operational effectiveness of the ASD system in the same way that the fan's location does. While all these elements can play a role in a building's structural integrity or aesthetic appeal, they do not have the same direct impact on how well the ASD system functions in mitigating radon exposure.