What is a major concern regarding the operation of depressurization fans?

The concern regarding the operation of depressurization fans primarily revolves around the potential for corrosion due to inactivity. When a fan is not in operation for extended periods, moisture can accumulate in the system, leading to rust and deterioration of components. This can hinder the fan's performance when it is eventually activated, making it less effective at reducing radon levels. Regular operation and maintenance are crucial to ensure the system remains functional and to prevent corrosion from becoming a significant issue.

Factors like noise pollution, energy consumption, and inconsistent airflow are valid concerns in the broader context of fan operation, but they do not directly relate to a fundamental aspect of the fan's integrity and effectiveness over time in the specific context of radon mitigation. Corrosion due to inactivity is more pressing because it directly impacts the reliability and efficiency of the depressurization strategy in preventing radon accumulation in buildings.