Removing Existing Diffusers from Schedule Quantity Counts

Quantity counts in schedules include all instances of each diffuser in the project. There is no way to filter it to exclude individual diffusers.

If you want to exclude existing diffusers from the counts, you must create a separate schedule entry for the existing diffusers. Add something to differentiate the entry from others, such as an "E" following the name.

In the Diffuser Project Schedule, uncheck the ☐ Include in Schedule box. This will remove the diffuser from the schedule inserted on the drawing.