If you need to replace a radon fan, it is important to follow proper safety procedures to avoid exposure to radon gas. Here are the general steps to replace a radon fan:

1. Turn off the power supply to the radon mitigation system.
2. Identify the location of the radon fan. It is usually installed in the attic or exterior of the building.
3. Remove the cover or housing of the fan using a screwdriver or other appropriate tool.
4. Disconnect the electrical wiring from the old fan.
5. Remove the old fan from its mounting bracket.
6. Install the new fan into the mounting bracket, following the manufacturer’s instructions.
7. Connect the electrical wiring to the new fan.
8. Replace the cover or housing of the fan.
9. Turn on the power supply and test the new fan to ensure it is working properly.

After replacing the radon fan, it is important to conduct a radon test to ensure that the levels of radon gas in the building are within safe limits. If the radon levels are still high, you may need to take additional measures to mitigate radon gas. It is recommended to consult with a professional radon mitigation contractor for guidance on the proper mitigation measures for your specific situation.