I have 1000w and am just about done building the room for it. However I had a venting question. The 1000w has a cool tube(glass and 2 holes for ducts, right?) so I'm imagining I have to get 2 for that? But then I need to pump co2 in to the room, would I also need to pump the air out at a separate location as well? I need to know what kind of fans(can't afford few hundred dollar vortex's) and how many I need I suppose. One of the few things I haven't researched too well. Do you guys use fans that attach in to the middle of the 6" ducting as well?
I use 1 fan per hood. Fan+++Hood++++Hoood (Legend) + Ducting Install your fan so that it 'sucks' air out of the hoods. http://www.htgsupply.com/Product-GrowBright- 6in-High-Velocity-Inline-Fan.asp - 6'' for $100