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http://fc08.deviantart.net/fs14/f/2007/006/7/1/Roots_stock_by_FractalAngel_Stock.pngJust jokin around...

What size passive intake holes would I also need on each 2x2x4 box with a "T' joined fan thats 200 cfm?

So are you saying a T joint vs a Y joint would work with no insulated ducting? That would be easier, I just wanna make sure that I wont be running into the dreadful temp problems.

Hey Fykshun, thanks again for your advice bro; greatly appreciated. This leaves with me with one more question. So I have a 200cfm fan. You are saying have a 6" (radius or diameter?) hole for air to be pulled through in the first box. What about the second box? 6" hole again or smaller to...

Hey thanks for the reply dude! Could you elaborate more on how you ducted? Or some diagrams on how it would work?

Hello all, I am nearing finishing my grow room, but I'm hit with the universal grow room problem: ventilation. I have two boxes. Each one is 2x2x4. Both will use hps/mh lights(250w) , which means heat. Additionally I also have a 200cfm sunleaves windtunnel. My goal is to ventilate both boxes...

Ok so here's the deal. I have a 250w/400w MH/HPS switchable n air cooled ballast. I am planning on exhausting passively with a 4" 200cfm sunleaves windtunnel. I got 10 feminized seeds (2 of them are autos). Here is my problem though: grow space. I am working with a grow space of 60" (or 84") x...