Which location is an approved site for installing ASD fans?

Choosing to install ASD (Active Soil Depressurization) fans in attics or outdoors is the correct answer because these locations allow for efficient operation and effective ventilation. ASD systems are designed to lower the radon levels within a building by creating a negative pressure in the soil beneath the foundation. By placing fans in attics or outdoors, the system can effectively draw radon gas from beneath the building, exhausting it safely away from the structure and mitigating potential health risks.

Placing ASD fans outdoors or in attics ensures they are exposed to less contamination from indoor air and allows for better dispersion of the radon gas, reducing the chances of it re-entering the building. It also minimizes noise and impacts on resident comfort since these locations are typically less frequented by occupants.

Other options, such as installing fans underneath the house, living rooms, or in basements, could lead to operational inefficiencies. For example, installation in living rooms could disrupt daily life and may not effectively ventilate the radon gas from below the foundation. Likewise, while placing fans in basements might seem practical, it's essential to avoid densely occupied areas to reduce potential exposure to radon. Therefore, the placement of ASD fans specifically in attics or outdoors aligns with best practices