Regular, proper ventilation is one of the key requirements for healthy living and protecting buildings. In addition to oxygen supply, ventilation in bathrooms primarily serves the removal of odours and humidity. At a relatively high air humidity, water vapour then condenses at places where the temperature is lower than that of the air. This then provides the ideal basis for mould.

Continuous ventilation

Continuous ventilation with a tilted window: this type of ventilation is not recommended, or only in the summer, as the room cools down too much leading to condensation on the cooler tiles, in addition to energy loss.


Airing: this is where the window pane is opened fully for a short time. Airing requires much less time to exchange the air in the room than tilted-window ventilation.

Cross ventilation

Cross ventilation: in cross ventilation, fresh air enters through a window on one side of the façade and the stale air leaves the building through a window on the other side of the façade. Cross ventilation provides the fastest and most effective exchange of air in the rooms.

Automatic ventilation

Ventilating windowless rooms: the exchange of air in bathrooms and kitchens without windows must be ensured by indirect ventilation. Vents, which are often coupled with the light switch, do however need a longer follow-up time to ensure optimal air exchange.

Ventilation times: as the cold air contains less moisture, ventilation times can be reduced in winter. Due to the large temperature difference between outside and inside air, air exchange is much faster and more efficient in winter.