^Thanks. Yeah, I haven't seen too many setups so I'm still curious as to how the fans are mounted. I was assuming you mounted it to the edge of the reflector or the edge of the tent, but that's a good point. I'll probably rig something to hang it from the inside somehow.

Also, I'm wondering how it would affect the air flow if I were to use a 6" fan and blow it through a 6"x4" reducer to exhaust. What will that restriction in the air path do to the total overall air flow? I'm thinking it would cause higher pressure between the fan and the reducer and slightly reduce the total air flow? Would this be negligible?
lampost Reviewed by lampost on . Ventilation setup - Any problems with this? All air over light... I'm setting up a first grow and the last remaining hurdle is ensuring adequate ventilation. Here's the set up: 4' x 4' x 6'-6" Grow Tent w/ a 600W HPS. Not a cooltube, but Easycool (I think, basically same concept with larger reflector). It's got a 6-inch "port" for ducting on both ends. So, my grow room has a volume of 104 CF. The grow tent I'm getting has 4-inch vents, and it seems the largest fan I can find in a 4-inch inline is like 172 CFM. This is the expensive Vortex. So, Rating: 5