what size case fan should i get for front intake

[immafrog1337]

if i buy an intake fan for my computer what size should i get. im gonna put it in the front

 

[Tabris DarkPeace]

No less than 80mm, and often people will use 120mm (if it will fit).
Just make sure your exhaust fan is as least as large and running at a higher rpm, or moving more CFM of air.

 

[SamGriffiths]

@immafrog1337
The biggest one you can fit, if you tell me the case you have I can recommend some fans.

@Tabris DarkPeace Let's not get into Negative vs Positive pressure.