yeah mine are hydrofarm habitats, i can't think of the other company but they call theres the homebox. they are essentially the exact same except one has gray trim and one had green, both made of exact same material. My current setup has a 4 inch inline fan exhausting out the top of the smaller 3.5 x 3.5, runs 24 hours a day, and runs over to the side of the 4.5 x 4.5 and feeds into the side of the sealed hood for the 1000w hps. The other side of the hood goes out the other side of the box to a 300-400 cfm cage style fan helping pull it all out of the room. The 4.5 x 4.5 also has a 4 inch inline that cycles on every 15 minutes for 15 minutes. I aso have a large oscilating fan hanging in the bigger tent and a small non-oscilating fan in the small room. I have nothing for intake as when i bought them the "GUY" at the LHS told me i would be fine on a passive system and just open the little screen things at the bottom and the one lower flange hole.
I am also having a issue with bugs after holding a couple plants for a friend in a pinch.. I am considering a tear down and major clean and bomb just to be safe as i only have a few plants right now of questionable genetics. If i do i think i will move them to the sides of the window and build a box around it to accomidate fresh air intake. thoughts??