^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?