To Use the Elevation Lock

By default, the elevation lock is turned off each time you add duct.

1. Add duct, and lay out the duct run, as explained in Drawing a Duct Run.
2. In the Properties palette, next to the elevation value, click the unlock button .
3. Specify points for the duct run.
   Tip: To connect a horizontal duct to a vertical duct, move the cursor over the vertical segment to get a duct curve connector, and click on it. If you have difficulty achieving the desired connection, try using a different view, such as a side or isometric view, when connecting the horizontal duct run to the vertical segment.
4. To turn off the elevation lock, click the lock button .