IEI Integration NANO-9453 v1.12 - Manual (Page 145)

NANO-9453 EPIC Motherboard
Page 127
BIOS Menu 7: Hardware Health Configuration
CPU FAN Mode Setting [Full On Mode]
Use the CPU FAN Mode Setting option to configure the second fan.
Full On Mode D EFAULT Fan is on all the time
Automatic mode Fan is off when the temperature is low
enough. Parameters must be set by the
user.
PWM Manual mode Pulse width modulation set manually
When the CPU FAN Mode Setting option is in the Automatic Mode, the following
parameters can be set.
CPU Temp. Limit of OFF