I'm sorry I forgot to mention but I am using cfls so I won't have the heat issues that hps set ups cause. I plan on doing something similar to those popular rubbermaid bin grows. I'm going to grow four lowryders in there and pulling males when ever they show. Then I'll replace the males with a new seedlings so I can have a perpetual harvest. Since I don't have to change the lighting to 12/12 for flowering I can do this. Any thoughts would be great. Would two of those 4" fans I mentioned get the job done. Thanks in advance.:rastasmoke: