On the side of my case, I cannot tell if the fan is for intake or if it is blowing air out... thats how weak it is. Is there a way I can tell? Here are pics.
Which way is the fan blades curved? The direction the fan blades curve from the center is the way the air is moving. It's most likely blowing air into the case.
IT IS blowing air out! I used a tissue like u said and from the inside it is getting sucked to the fan. hmm since I only have 1 intake I think ill flip it around.
I just found this out with those yate loons and all my old fans I've been messing around with. I thought it might be different for different fans but it seems to be true for all.