Which of the following is NOT a permissible location for an ASD fan installation?

The correct answer regarding the permissible locations for an Air System Depressurization (ASD) fan installation is that it should not be placed in conditioned or otherwise occupiable spaces. This is primarily due to safety and performance considerations.

ASD fans are designed to help lower radon concentrations by drawing radon-laden air from beneath the foundation of a building and expelling it above the roof level, thus preventing the harmful gas from entering occupied areas. When these fans are placed in conditioned spaces—such as living rooms, bedrooms, or other areas where people spend a significant amount of time—there could be several potential issues.

One concern is the potential for noise created by the fan, which could be disruptive in habitually used rooms. Another critical reason is that if the fan were to fail or malfunction while located in such spaces, it could lead to gas flooding into the home instead of being effectively mitigated. Therefore, it is crucial to keep ASD systems installed in non-occupied or less critical areas where both noise disruption and potential safety hazards can be minimized, assuring the health and well-being of the occupants.

In contrast, locations like attics, garages not beneath occupied spaces, and the exterior of a building are acceptable positions for ASD