To Create a Duct System Definition

In the HVAC workspace, click Manage tab Style & Display panel Style Manager drop-down HVAC System Definitions .

Create the duct system definition:

To…	then in the left pane of Style Manager…
create a new, blank system definition	right-click Duct System Definitions, and click New. Enter a name.
copy an existing definition, so you can modify the copy Tip: The default templates contain several system definitions to modify or copy.	do the following: Right-click the system definition you want to copy, and click Copy. Right-click Duct System Definitions, and click Paste. Right-click the copy, click Rename, enter a new name.

In General Description, enter a description for the duct system.
Specify values for other general properties common to systems in all engineering disciplines. For more information, see Creating Systems.
Specify a calculation method for duct sizing.