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In the air flow schedule, click on the ducts whose length you want to adjust.
The program opens the dialog for entering the duct length.

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Enter the desired value and confirm with Enter.
The program jumps to the next duct length in the air volume plan.
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When you have entered all the duct lengths, close the dialog by pressing Esc.
You can now output the ventilation concept and the layout including the air volume plan.