The problem of condensation
According to statistics, there are 2 million houses in the Federal Republic of Germany with sometimes considerable problems with moisture in basements and basement rooms. Ventilation is often done wrong, so that in addition to the already existing moisture in the masonry, there is also condensation moisture. The walls suck themselves with the condensation moisture fully and large-scale mold formation is then only a matter of time. Here, automatic ventilation provides a lasting remedy. If the moist air is replaced by dry air in a room, a slow drying takes place on the inner wall surface. Actually, one should only ventilate when the outside air is cooler. Cool air contains little water vapor, so the absolute humidity is lower. If this is only slightly heated by the basement room, which is done with automatic ventilation, this mixed air can absorb moisture again.