Which aspect is crucial for ensuring a successful Active Soil Depressurization system?

The crucial aspect for ensuring a successful Active Soil Depressurization (ASD) system is the proper sealing of openings. This element is fundamental because an ASD system functions by creating a vacuum that draws radon gas from the soil beneath a building. For the system to operate effectively, it is essential to prevent outside air, including radon-laden air, from entering the building through any gaps or openings.

If openings such as cracks in floors, walls, or at the junctions of walls and slabs are not properly sealed, it can compromise the system's performance. Unsealed areas can allow radon to infiltrate the building, which would counteract the depressurization effect and potentially expose occupants to harmful levels of radon gas.

While material costs, inspection frequency, and the choice of materials all play roles in the installation and maintenance of the system, the integrity of the sealing ensures that the depressurization is effective and that any radon gas is directed safely away from the living spaces. Therefore, focusing on proper sealing is paramount for the system's success in reducing radon exposure.