~Ohhh... that model uses a reverse fan. That's why the confusion.
@Alexxx99 , look for 2 arrows on the frame of those fans, like in that one image SkyNetRising linked. One shows what direction the fan spins(clockwise/counter), which doesn't matter, but the other one does. Are both pointing towards the back of the PC? That's what you want.
Now, the front fans, I think are a problem. Most likely weak LED fans being choked by the front panel's design/style, which isn't bringing that much air inside the PC.
What I suggest doing:
1)Remove the middle fan and make it the rear exhaust.
2)The remaining 2 are likely installed like this:
fan bracket | fan | front panel
Make it like this instead:
fan | fan bracket | front panel
Don't flip the fans around - all that's being done is moving them back a little bit.