EXFO FTB-2 - Manual (Page 20)

Introducing the FTB-2 and FTB-2 Pro
10 FTB-2 and FTB-2 Pro
Automatic Fan Speed Management
Automatic Fan Speed Management
Your unit will determine the most appropriate fan speed, depending on the
power requirements and the type of modules you are using.
I
MPORTANT
Fan speed is always determined to cool down the most
heat-generating modules.
C
AUTION
Make sure to use protective covers over empty slots of your unit to
avoid overheating.