Most cooling fans are blow type, that is, blow the surrounding air to the cooling object to help speed up the transfer and dissipation of heat. By blowing the air, the cooling fan can take away the overheating air, thereby reducing the temperature of the cooling object.

However, it is also possible to design some two-way cooling fans that can both blow and suck air. These fans can change the direction of blowing and sucking air when needed to adapt to different heat dissipation requirements. The suction function can be used to bring in fresh air, increase air flow, and help the cooling system expel heat better.

In general, most cooling fans are blow type, but there are also some two-way cooling fans with blow and suction functions. The specific type of cooling fan used depends on the cooling needs and equipment design.

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