Hello!
We are in the process of radon-proofing our two-story house, built around 1900. We've had some companies come by to inspect and they suggested installing radon fans at two different points. There are already two duct fans installed (by the previous owner) which have questionable effectiveness. One company wants to connect a more powerful fan to one of the points (which goes down into a small wine cellar in the house) and make a hole in the foundation (natural stone...) to insert a pipe and connect another fan on the other side of the house. Additionally, fresh air vents will be installed in all rooms of the house.
It's not possible to access the foundation.
One problem is that the houses are very close together in the area. The fan we were quoted on turned out to be quite noisy (we listened at another place where a similar fan is installed).
The question is if there is anyone else on this forum who has done such an operation themselves.
