Intel AIMB-253 - Manual (Page 27)

17 Chapter 2 Hardware Setup
2.6.6 Fan Power Connectors: CPUFAN1, SYSFAN1
The fan power connectors support system cooling fan with +12V. When
connecting the wire to the connectors, always take note that the red wire
is the positive and should be connected to the +12V, the black wire is
Ground and should be connected to GND. If the mainboard has a System
Hardware Monitor chipset on-board, you must use a specially designed
fan with speed sensor to take advantage of the CPU fan control.
Figure 2.9: Fan Power Connectors: CPUFAN1, SYSFAN1
Note Please refer to the recommended CPU fans at Intel® / AMD®
official website or consult the vendors for proper CPU cooling
fan.
CPUFAN1
SENSOR
+12V
GND
SYSFAN1
SENSOR
+12V
GND