Drawing Flexible Duct Segments

1. Open a view containing the duct system where you want to add flexible ducts.
2. Click Systems tabHVAC panel Flex Duct.
   Note: You can also use the Draw Flex Duct option from the context menu when right-clicking a duct end connector. See Connecting Flexible Ducts to an Existing Duct System.

   Some components have multiple connectors that display stacked one above another. When drawing flexible duct from a stacked connector, a Select Connector dialog displays to let you specify which connector to use.

3. In the Type Selector, select a duct type that matches the ductwork where you want to connect the new duct.
4. On the ribbon, select placement options.
5. On the Options Bar, specify layout options, and click Apply.
6. On the ribbon, verify that Tag on Placement is selected to tag the duct automatically. Then specify the following tagging options on the Options Bar:

   If you want to...	then...
   change the orientation of the tag	select Horizontal or Vertical.
   load additional tags	click Tags.
   include a leader line between the tag and the duct	select Leader.
   change the default length of the leader	enter a value in the text box to the right of the Leader check box.

7. In the drawing area, click a starting point for the flex duct.

   When connecting to an existing duct, you can click the connector on a piece of mechanical equipment or an air terminal, or click the centerline of the existing ductwork to establish a starting or ending point for the duct.

   Some components have multiple connectors that display stacked one above another. When drawing flexible duct from a stacked connector, a Select Connector dialog displays to let you specify which connector to use.

8. Drag the end of the duct preview along the path that you want the flexible duct to follow.
9. Click at each point where the duct will bend.

   Clicking at the bends in the flexible duct places vertices that you can use to reshape the flexible duct. You can also insert and delete vertices, using options from the flex duct context menu.

10. Click the connector on an air terminal, duct segment, or piece of mechanical equipment to specify the end the flex duct.
    

    Transitions and tees are automatically added to the duct system to facilitate the connections for the flexible duct.

    Round duct elements (rigid and flex) display with centerlines in hidden line view. For duct fittings, you can override the default centerline by editing the family, adding a model line, and setting its subcategory to centerline.

    Oval and rectangular duct elements do not display with centerlines in hidden line view.

    By default, centerlines are turned off in U.S. templates.