Mechanical ventilation with frequency conversion technology is used during winter to remove excess moisture from and bring oxygen into the building. Ventilation aggregates are installed on the walls (500 mm diameter axial fans) with stopped forced ventilators. There is a gap between the ventilator and its shutter, which generates airstream to direct polluted air towards the ridge vent. There are forced ventilation outlets at the ridge of the building which ensure air exchange rates of up to 25,000 m3/h. TARK LAUT ventilation solution allows to direct the airstream along the roof and, if necessary, to the floor.