What is the effect of mechanical equipment on radon entry into buildings?

Mechanical equipment, such as exhaust fans, HVAC systems, or other ventilation systems, can influence the entry of radon into buildings in specific ways. For instance, these systems may create negative pressure in a building. When this happens, air from outside, including radon-rich soil gas, can be drawn into the building through lower-pressure areas, potentially increasing radon levels indoors.

This effect is particularly relevant in tightly sealed homes or buildings where mechanical systems increase the air exchange rate and disturb the natural flow of air that could otherwise limit the entry of radon. Increased mechanical ventilation could complement mitigation strategies, but if not managed properly, it may inadvertently facilitate the movement of radon gas into the living spaces.

Understanding the dynamics of how pressure differentials created by mechanical equipment interact with the natural radon levels present in the ground is crucial for effective radon mitigation strategy. It emphasizes the importance of designing and implementing ventilation systems that consider radon's potential entry into buildings.