2 In, 2 Ex, 1 CPU, or 2 In, 1 Ex, 2 CPU?

[Zaughtilo]

https://pcpartpicker.com/list/dRqGvV

I ordered two 140mm fans for intake because the case didnt come with any. I am wondering if I should keep the two preinstalled ones as exhaust, or add the top one onto the Cryorig H7 and keep one exhaust on the back. I obviously don't plan to OC because the cpu is locked

 

[Twin-Frozr-1212mV]

Hmm. I was always a fan of underpressure in the case --> more exhaust than intake avoid standing air in the case
In your scenario you'd need 3x120mm as exhaust, but the s340 doesn't support that

Anyway, just keep it the way it is (2x140 front / 2x120 top&rear), there's no need to spend any more money on fans.
None of your components will overheat

Hope i could help you