You can delete a zone from a project when you no longer want to retain any information about the zone. 
Note:  The Default zone cannot be deleted. 
- In the Project Browser, open a floor plan that contains the zone that you want to delete. 
Note: Zones do not display in elevation or 3D views. 
  
- Do one of the following to delete a zone: 
- In the floor plan or section view, select one or more zones that you want to delete, and press DELETE on the keyboard, or click Modify | HVAC Zones tab
Modify panel
 Delete.  
- In the System Browser, right-click a zone, and click Delete. 
 
- In a Zone schedule, select one or more rows that contain zone information for the zones that you want to delete, right-click, and click Delete Row(s), or and in the Schedule panel, click Rows:
Delete. At the warning message, click OK.  
 The zones and corresponding zone information are deleted.