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1.  On the [Model] tab, go to , click [Solid], and select [Box [Specify Length]] on the submenu.

2. Designate the starting-point.
   
   In the parameter input dialog box, enter Startpoint (X:-35, Y:-35, Z:-10) and click .
   
    

3. Set the width.
   
   Enter Width: 70 and click .

4. Set the depth.
   
   Enter Depth: 70 and click .

5. Set the height.
   
   Enter Height: 20 and click .
   
    

6. Click in the parameter input dialog box and exit.
    

14. It is also possible to exit with the <Esc> key.
    
     

The box for the air domain (Air) has been created.

* Shown by wireframe.