Final answer:
The acceptable locations for the fan in an active soil depressurization style radon mitigation system are typically on the exterior of the house, where it can effectively draw radon gas from beneath the basement floor and vent it above the roof.
Step-by-step explanation:
For an active soil depressurization style radon mitigation system, the acceptable locations for the fan are typically on the exterior of the house. The fan is usually installed in a location where it can effectively draw the radon gas from beneath the basement floor and vent it above the roof. This helps to prevent radon from entering the living space and ensures adequate ventilation to reduce radon levels.