SOYO SY-K7AIA User Manual page 43

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:
SENSOR
Note: CPUFAN must be installed for this Motherboard, CHAFAN is
optional.
Chassis Cooling Fan
CHAFAN Pin Assignment
3 2 1
GND
12V
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SY-K7AIA