Fans in a pc help a friend out

Jul 5, 2018
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I am having a (Tortox Shadow Extreme Mid Tower Gaming Case with RGB Fans)

As you can see it has 3 fans infront only

And on the top i have kraken x62 as exhaust fan i would say because when i keep my hands there and its spinning i can feel air is going out > since i didnt build the pc my self i am not sure

And i would like to keep an exhaust fan behind do you think thats a good idea or ?

My temp is not that high but i always want to do the best for my pc and thank you all in advance.