Do I need a fan?

[TaurusX]

Hi all, I'm thinking of building my computer and was wondering if a case fan is necessary. I watched a video about building and it seems that cases come with a fan, so. Here's the build: http://pcpartpicker.com/user/TaurusX/saved/X3PcCJ
EDIT: sorry about the wrong forum, didn't check until too late...

 

[Suztera]

The case you got comes with two fans: One 120mm at the front and one 120mm at the rear.
That setup is sufficient enough. Adding more fans is optional and is down to you.