Use this procedure to define the distance that a curtain wall unit frame is from the floor line, roof line, or baseline. By default, the outside edges of the frame align with start and end of the floor line and the start and end of the roof line. When you adjust the width of the frame, the frame expands inward. However, you can use offsets to expand or contract the frame away from these default limits or to shift the frame away from the baseline in either the X or Y direction.
| Offset | Description |
|---|---|
| X | Positive X offset moves the frame edge outward beyond the end of the curtain wall unit, while a negative X offset moves the frame edge inward toward the center of the curtain wall unit. |
| Y | In Plan view, a positive Y offset moves the frame edge above the baseline, while a negative Y offset moves the frame below the baseline. |
| Start | Negative Start offset lengthens the frame beyond the start point, while a positive Start offset shortens the frame. The start point for vertical edges is the baseline and, for horizontal edges (drawn left to right), it is the left side. |
| End | Negative End offset lengthens the frame beyond the end point, while a positive End offset shortens the frame. The end point for vertical edges is the base height and, for horizontal edges (drawn left to right), it is the right side. |
Specifying frame offsets
- Click
. 
- Expand Architectural Objects, and expand Curtain Wall Unit Styles.
- Select a curtain wall unit style.
- Click the Design Rules tab.
- In the left pane, select Frames under Element Definitions.
- Select a frame definition from the list.
- Specify an offset distance for the frame edge X, Y, Start, or End.
- Click OK.