Which should you PC fan go for exhaust?

Is there a particular way it should be facing for the exhaust? It seems like the airflow is the same on both side. Which side pushes the filtered air out?

Hi Taylored. If you look on the outside edge of your pc fan you will see an arrow for the direction of the blades and and an arrow for the direction of air flow. If you can`t see it let me know and i`ll see if i can help you out with a photo of one.
Good luck and Happy Growing

Edit: Exhaust means sucking the air Out of your Room/Tent or Whatever your growing in...
Hope this help`s you

There was a sticker over the arrows. I am going to position it with the arrows pointing out.