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
Tol Reviewed by Tol on . Heating and light queries 600/400hps/MH ,optimal exhaust fan? Hi all I'm looking for some advice from experienced growers with regards to the size of light, heat generated and the right exhaust fan to deal with that heat in a closet grow. Ok let me give you the grow breakdown and info first. Clost floor square feet equals 4.59 square feet or 1.39 square meters. Height is 198cm or 6.49 feet - plants will hit the light anything above 178cm I'm vegging in a box i built with 9000 lumens cfl, going well, so the closet area is going to be used Rating: 5