Climate on cloud 7

Air is our most important food. We inhale about 15 kg of air every day, 90% of it in closed buildings. Therefore it is necessary that the buildings are supplied with fresh air. Whereas the building envelope used to have natural breathing, the walls and windows of modern buildings need to be insulated for energy reasons. Natural air circulation is prevented. So that we do not have to do without good air nevertheless, we have the solution...
Climate on cloud 7