Does the case fan blow air in or out?

i cleaned my pc out for the first time and i forgot which way to screw the case fan back on, its blowing the air into my case and not out, did i screw it back on the correct way?
i'm so stupid -.-

many thanks
3 answers Last reply
More about does case blow
  1. Which fan ? The rear fan should be blowing air out , front fan and side fan in .
  2. jerry6 said:
    Which fan ? The rear fan should be blowing air out , front fan and side fan in .


    i was wondering about the front, thank you very much :)
  3. front blows in
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