okay so I'm trying to figure out how to put case fans on my dell e521 also I found this youtube video of these case fans inside this guys dell and was wondering what kind they were also there are no screw holes to mount than fans on so im curious on how he got them on there heres the link of the video
http://youtu.be/smKF2fB1_9g
http://youtu.be/smKF2fB1_9g