You use the same tools and methods to draw ductwork in elevation views as in plan views. However, because you are viewing the layout from a different perspective, the results are not always what you may expect. Ductwork drawn in a elevation view is drawn relative to the elevation view plane. When drawing in an elevation view, you should keep a 3D view or plan view visible to view the results of your actions. Here are some things to keep in mind:
One exception is when you press Space while adding a duct to existing ductwork. In that case, the new duct assumes the size of the existing ductwork. The Options Bar displays the width and height of the existing duct, and the duct being added is drawn with those dimensions. But, when you add a horizontal duct to an existing duct that displays as an end view (perpendicular to the view plane), the width and height are reversed. What this means is that the value for width is measured in the view from top to bottom, and the value for height is measured is the left to right dimension. The following examples show the orientation of ductwork added in elevation views. In these examples, all of the existing segments are 12" W x 8" H.
The new duct will connect to the available connector nearest the view plane (in the foreground) for the elevation view. An available connector is one that is not already connected to another connector, and is within the bounds of the elevation view. (The only boundary for an elevation view is the view plane in the foreground.)
In the following example, both connectors on the existing duct (1) are available. The horizontal segment added in the elevation view (2) is connected to the connector nearest the view plane, as shown in the plan view (3).
Two connectors within the view range
If there is only one available connector within the view range, that connection will be used. In the following example, the connector nearest the view plane is already used (1). When the new duct is added in the elevation view (2), it is added at the far end of the existing ductwork (3), using the only available connector.
Only one available connector within the view range
If there are no available connectors within the view range, as in the plan view (1), the new duct (added in the elevation view (2)) is connected with a tee at the intersection of the elevation view plane and the existing ductwork (3). The centerline of the duct is placed exactly over the view plane.
The only connector within the view range already in use
In the following example, 2 vertical duct segments are added to a ductwork in an elevation view. The original ductwork is shown in a plan view (1), in the associated 3D view (2), and in the south elevation view (3).