SOYO SY-7IWB User Manual page 40

Hardware Installation
(2) Chassis Cooling Fan
Some chassis also feature a cooling fan. This Motherboard features a
CHAFAN connector to provide 12V power to the chassis fan. Connect the
cable from the chassis fan to the CHAFAN 3-pin connector. Install
according to the following pin assignment:
Note: CPU cooling fan must be installed to prevent CPU from
overheating and ensure system stability. Chassis cooling fan is
optional, depending on whether there is cooling fan in your chassis.
Chassis Cooling Fan
CHAFAN Pin Assignment
1
GND 12V
3
2
SENSOR
36
SY-7IWB