Fan Noise
During the fan replacement, we discovered the cause of the noise - unfortunately, a bird had entered the discharge pipe and become caught in the fan.
No critter guard
To prevent problems like this, all of our systems include a critter guard at the top of the pipe to keep animals out. This system is not only missing a proper guard to prevent birds and other animals from entering, but it is directing the radon gas back down towards the house. Not good.
