To model the air flow around the device, we need to surround it within an air volume.
Questions about applying settings?
Click Geometry Tools from the Setup tab.
On the Geometry Tools dialog, select the Ext Volume tab.
To resize the volume, left click and drag each grab handle:
+ X = 200
-X = -180
+Y = 150
-Y = -50
+Z = 400
-Z = -200
Click Create.