According to ANSI-AARST radon standards, what is the required wall thickness for suction pipes?

The correct answer identifies that Schedule 40 is the required wall thickness for suction pipes as per ANSI-AARST radon standards. Schedule 40 pipes possess a wall thickness robust enough to handle the pressures associated with radon mitigation systems, thus ensuring the integrity and longevity of the system. These pipes are commonly used in radon mitigation because they can effectively transport radon gas from below the foundation to the atmosphere without the risk of collapse or leakage.

Choosing Schedule 40 relates to its balance between strength and cost-effectiveness, making it suitable for the demands of radon mitigation work. This standard is established to minimize safety concerns and maximize efficiency in radon extraction systems. The other options, while they refer to different schedules of pipe thickness, do not align with the standards required for ensuring effective mitigation, as they either do not provide sufficient structural integrity or are not necessary for the application.