Case fans on NZXT s340 plus PSU

sangone

Prominent
Mar 30, 2017
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https://pcpartpicker.com/list/9tjKbj - this is the build, wanted to know if its fine if I just put the fan on the top infront for intake and leave the rear one for exhaust or i have to buy 2 fans and put them infront and use top and rear as exhaust ? And I would also need a modular PSU as Its the first time im building a pc and cant handle cable management etc.