Share Email Facebook Twitter LinkedIn About Modifying a Duct System The topics in this section offer specific instructions on how to modify all aspects of a duct system. You can modify duct systems in your drawings at any point during the design process. Related Concepts About Duct Properties Palette (Modify Mode)About Modifying Components Using GripsAbout Modifying HVAC EquipmentAbout Modifying Duct Related Tasks To Check Connectivity in a Duct SystemTo Modify a Label