SOYO SY-K7VIA User Manual page 42

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:
CHAFAN Pin Assignment
GND
Note: CPUFAN must be installed for this Motherboard, CHAFAN is
optional.
Chassis Cooling Fan
1 2
12V
3
SENSOR
38
SY-K7VIA