English: Air exchange in buildings account for 15 percent of all energy losses in countries with a climate like Germany. The invention is based on the maximum possible efficiency physics allows to reduce the energy requirement of buildings and thereby the overall energy requirement of western economies by up to 15 percent.

Considering the very low investment for such ventilation devices and how fast they could be implemented the environmental and economical benefit over the course of this century could be much greater than that of the electric vehicle revolution. That is if both technologies are compared over the entire life-cycle of the global introduction.

The invention has become the new standard in Germany and is being produced by many companies. Yet it has never been done properly according the original patent file...