Create the Internal Fan Material
To open the Material quick edit dialog, click Edit from the Materials context menu:
Change the Type to Internal Fan/Pump
On the Material line, Click Edit...
Enter the name Fan in the Name field
Select My Materials from the Save to database menu.
Click the Flow button.
Variation Method = Constant
Value = 0.56. Units = m3/min
Click Apply.
Click the Rotational speed button.
Variation Method = Constant. Value = 0 RPM. Click Apply.
Click the Slip factor button.
Variation Method = Constant. Value = 1. Click Apply.
Click Save.
Click OK.
For more about Internal Fan Materials