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Click Select on the vertical toolbar.
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Select the duct run for which you want to change the flow direction.
The software displays the flow direction indicators. In the following example, a duct run is going downstream:
The flow directional indicators are listed below:
Bi-directional
Upstream
Downstream
No flow
Undefined
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Click one of the flow direction indicators.
The software displays a FLOW submenu containing each flow direction indicator.
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Select the new flow direction and then close the submenu.
You also can click Properties on the ribbon to edit the flow direction property of a run.