1, the water-cooled fan is installed by internal cold exhaust and blowing. The fan usually rotates clockwise. At this time, the direction of airflow can be confirmed according to the direction of fan rotation, so as to distinguish the front and rear of CPU fan. The suction surface is positive (outward); The blowing surface is the reverse side (inward).
2. The direct power-on test shows that the blowing side is the reverse side (installed towards the heat sink) and the sucking side is the front side. The water-cooled cooling fan does not need to deliberately distinguish between positive and negative, just confirm the wind direction of the fan. When installing the fan, it should be installed according to the principle of "front pipe and rear pipe". That is to say, natural wind enters from the air inlet of the front panel of the chassis, and the heat in the chassis is exhausted by the suction of the cooling fan to the back panel.