120mm Fan Direction?

[Pencheven]

Hello folks

Was wandering if you guys could give me a hand with a simple question.
On the side of my case I have an opening which allows a 80mm fan to be connected, however I have replaced this with a bracket which allows a 120mm fan to be connected (80 to 120 converter plastic) and the next step is getting a fan to put on. (Wanted to check first with a cheap bracket before getting the fan)

As pictured in the image, you can see by my superior MS Paint skills that im a little confused in which way the fan should blow air on the side of the case. The CPU fan blows air onto the board, so would it be a good idea to have the air blowing inwards from the side of the case?

Or would that destroy the flow of air coming from the front, so would it be a better idea to have the air blowing from the inside out on the side?

Thanks

[JPMiller]

For correct airflow, the fan should be blowing cool air from outside the case inward (not outward)

[Pencheven]

Thank you for your quick reply