Awesome fan for 3000 or 4000 check this out

[nOw2]

It looks very big to fit in a 3000/4000 case.

I've used versions of this: http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=39598&Sku=S457-1005&CatId=804 for some time, although I've found them to have quite short lifespans. They certainly blow huge amounts of air out the back and are very effective in a packed 4000T, should be ideal in a 4000 if you get the air-flow direction right.