Cell phones of the first generation often didn't work in Holz100 buildings. Meanwhile the small percentage of rest radiation which enters through the window frames is enough for it to work.
The tenant of a Holz100 home still has the advantage that the radiation density is drastically lower inside the building compared to the outside. Laboratory tests showed that Holz100 elements blocked up to 99% radiation, depending on frequency.
Holz100 Canada Inc.