Fill Gaps
- Last UpdatedJan 07, 2026
- 1 minute read
Once the gaps which are currently filled with implied ducting have been identified, the implied ducting can be replaced automatically with ducting straights.
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To identify each gap and calculate the required fixed length of ducting straight to fill it, select Utilities > Autofill with Straights > Fill Gaps from the main menu to display the Autofill with Straights. (HVAC) window.

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After selecting the required pieces of HVAC in the Design Explorer, select Apply.
The Autofill with Straights. (HVAC) window displays all the identified gaps but also the specified straight lengths are created automatically to replace the implied ducting.
All corresponding lengths of implied ducting are highlighted red in the 3D Graphical View.
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Selecting Unhighlight removes all the red highlighting from the 3D Graphical View.
The red highlight is also removed from the 3D graphical view, once the Highlight Implied Ductwork. (HVAC) window is dismissed.