In relation to new energy-saving norms, more and more measures are taken for a better heat insulation. High insulation characteristics lead to reduced heating expenses, raw material economies, reduced harmful gas emissions in the atmosphere and less negative influences on the ozone layer. That is why the requirements for modern window and doorframes are for even better insulation properties and minimal heat loss.

Due to the high energy-saving characteristics and tight sealing of window and doorframes, it is vital to ensure adequate ventilation. Depending on the specific situation, it is advisable to regularly let fresh air into the room if the windows are not opened often.

Different smells, gasses, moisture and harmful chemicals affect not only your comfort but can also damage the structure and outer covering of the walls.

Good ventilation has the following functions:

- Ensures good air quality and healthy conditions

- Prevents water condensation and fungal growth thanks to the improved air circulation

Sanitary norms recommend between 10 and 25 m3 fresh air per hour per person. About 60 m3 of fresh air an hour is needed for a room with 3 people inside. For a house, the advisory average air volume coefficient is 0.5 h-1 (DIN 1946-6). It means that every hour half of the air inside should be refreshed, and to do this, special measures have to be taken.

Normal ventilation through the window frames is not sufficient to meet the above-mentioned norms.

The ventilation vent with an air-volume regulator responds to external wind pressure and ensures controlled airflow.

Operation principle:

- The set consists of two simple vents, 125 mm in diameter, and a special sealing in the wing.

- The vents have different counterweight elements ensuring their different response to different wind velocity.

- The vents are installed horizontally above the windows, which ensures good airflow control.

- Fresh air from outside enters from above into the room.

- There is no draught because the control mechanism responds depending on the wind pressure.

Advantages of the vent system:

- Different flow depending on wind velocity

- Automated regulation

- Controlled air exchange and removing moisture from the room

- No draughts;

- Prevents fungal growth

- Meets all energy-saving requirements.