So how did your harvest go? I have pretty much the same set up as yours. I've been having heat issues with my 2'W x 2'L x 4'H. I use a 400switchable ballast with both 400w metal halide for veg and 400w HPS. I have the 4" S&P Inline silent fan and that thing wasn't pulling air enough so I actually have ordered a 6" with a square filter and returning the 4". I hope this solves the heat issue.

I was up to 100-104 with my 4" fan with a can filter. When I detatched the carbon filter, the temp went down to mid 80's which made me decide to upgrade my silent fan to 6".

I'm curious how yours turned out since I can relate to you. Any updates would be awesome. Thanks!

~tol