This has come up before. The problem is that while that device can produce copious airflow, it can only do so when it isn't facing significant backpressure -- blowing into an open room, not into a small enclosed space like a case. Stick it in the front of a case, and a lot of air would end up blowing back out through the center of it, which is probably not what you want. Now, you might then choose to rig up two of them, with one acting as an exhaust to keep pressure close to ambient; that might work so as long as you kept it (and the case) well away from any walls or desk sides, etc. But now you're talking about a very expensive setup, and it probably still wouldn't be as effective as some modern top-end case fans.