case fan

Plug it in and test it out.

There is probably a standard way to find out, but I didn't know it. So just plug it in and give it a try.
 
Look on the fan, there's usually little arrows showing you which way it turns and which way the air blows. Most fans i looked have blows the air towards the back side of the fan (front side as where the blades are, back side as where the wires and supports are).
 
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