Directional pressure- and tunnel fans

The basic idea of ​​the system is that the ventilation is used to treat a parking space with more blowers, who play in one system eg. supply air gap air is brought down and then need to be used in accordance with the direction of the pressure blowers to move "spoiled" air again  through the gap and then out again.
The system operates only when there  is traffic and the setting value is exceeded, then the system starts. However, if the content is still rising, then the fans will start to spin to greater speeds.

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