The CM Stacker 832 can hold up to, I believe, 9 x 120mm fans in total. It already comes with 4 or 3 x 120mm fans. Two in front, one on top, and one at back. You have the option to put 4 x 120mm or 140mm fans, on the side panel...and add 1 or 2 more 120mm fans, in the front.
edit: Nevermind, the CM Stacker 832 comes with only 2 x 120mm fans. One at the front, and one at the back.