Reverse Branch
Use Reverse Branch to reverse the direction of airflow in a nominated ventilation branch.Instructions
On the Underground menu, point to Ventilation, and then click Reverse Branch.
Select the desired ventilation branch.
Once selected, the direction of airflow in the chosen branch is reversed.
Cancel when you have finished editing the branch direction.
Use the Save Network option to save the recently made changes.
Note: The change in airflow direction can be undone through using the Undo option, or by selecting the Undo button from the Standard toolbar. However, if you have saved your changes, then you will need to reselect the Reverse Branch option before selecting the recently modified branch.