Hi
> As far as I know it's suppose to blow air out of the box (sucking junk into the diskdrives).
In the A3000T the fan sits at the inner side of the PSU, so it blows the air INTO the PSU-case (and through that box and out of the tower case at the back side).
Back a few years I've made a mistake as I replaced this fan. If you take the PSU out of the tower to replace the fan you can easily accidentically exchange the direction of the fan, because it is opposide to the usual direction. After putting back the PSU into the case I wondered why the case was getting so hot, it was sucking the hot air out of the PSU and blowing it into the case :-)
Noster