I have a fan powered radon mitigation system installed in my house. It was installed in 2016 and I have not had any issues with it until this winter. I live in northern Iowa where we have been getting some unusually extreme temperature variations this winter (10F - 55F on some days).
I believe the system is exhausting warm moist air which is then freezing within the 4" exhaust pipe. As the pipe heats above freezing, this ice releases and falls into the exhaust fan. This causes some extreme noises (Much like marbles in a blender) until the ice has been chopped to small enough pieces by the fan to fall further under the slab.
The installer claims that the fan is designed for this, but I have to think that this happening on a daily basis will shorten the life of the fan (Not to mention the whole house panic when this happens in the middle of the night (Due to loud noise)).
What are my options to prevent this ice from making noise and destroying my radon fan?
Note: Basement has no water issues, and radon manometer shows normal readings.