What CPU Fan Rotation Direction?

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22 Oct 2012
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I bought the Corsair H100i and wish to have a push/pull config. I'll have 2 fans on one side of the radiator and 2 on the other. I know how to position the fans for the correct air direction but what difference does the fan rotation direction matter? Should all 4 fans have the same rotation direction? For example should I have the fans positioned vertically so I can see the arrows and should the arrows be facing left or right?
 
So why are there 2 arrows if the rotation direction doesn't matter, if I just position the fans based on the airflow direction I want? I don't really undestand the point of having an arrow for the rotation direction if it doesn't matter?

If I sit the fan vertically I can see 2 arrows on the top of the fan. One is pointing down (airflow direction), the other is pointing right (to the side). What direction should the side arrow be facing on all 4 fans?
 
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