What is cascaded ventilation and how does it work?

Cascade ventilation is an innovative ventilation concept in which several living spaces that cannot be ventilated independently of one another are intelligently connected. The aim of this method is to ensure an efficient and needs-based supply of fresh air in different areas of an apartment or house without having to install a separate ventilation system in each room.

This concept distinguishes between two types of rooms: rooms with direct ventilation and exhaust (with an installed ventilation system) are referred to as primary rooms, while rooms with cascade ventilation (without a directly installed ventilation system) are referred to as secondary rooms. In our example, the bedroom with e² is the primary room and the adjoining side room is the secondary room.

Ventilation cascadable rooms:

For the cascaded ventilation system to function optimally, it is important that only rooms with the same or similar types of use are connected to each other. The air flow always moves from the primary room to the secondary room. It is essential to prevent air from rooms with high odor or humidity levels, such as bathrooms, toilets, kitchens, or utility rooms, from flowing into other living areas. This prevents unwanted odor transfer and ensures a pleasant indoor climate.

⇒ Note: A practical example of such a connection is, for example, combining a bedroom with a children's room or a living room with a study. In this case, the active overflow element ILD can be easily connected in cascade for ventilation purposes, enabling controlled and efficient air exchange between the rooms. This intelligent cascading not only increases comfort, but also improves the energy efficiency of the entire ventilation system, as fewer devices are required and the air is directed precisely where it is needed.