[SOLVED] Is nessesary to have all fans in this case ?

I think it's going to depend on your hardware.

For instance....I deal with quite a few run of the mill business PCs like Dell etc....and they generally only have a PSU fan and a CPU fan....but they aren't putting out the heat that a high end gaming PC would.
 
Hey.
ECLIPSE P350X seems a good case for normal game setting and for that, one fan was never a problem.

But well, one more fan would be better depending on witch graphic card you want to put in.
 
Ah,sorry forgot to include the components.
CPU: Intel Core I5 9400f
GPU:MSI GTX 1060 Armor
CPU Cooler:ARCTIC Freezer 34
RAM:Corsair Vegenance 16GB DDR4 2666mhz
PSU:Evolveo G550
MB:ASUS TUF B360 Pro Gaming