Thanks for the advice. Here's what I've done. I put a 2" passive intake in the bottom. I have a 6" oscillating fan right inside the passive intake and pushing air to the top where I have a 4" 80cfm cpu fan for exhaust.

I still have to install the 80cfm tonight. My total area is about 8.5 cubic feet - will the 80cfm's fan be enough to bring down heat?
kennbuds Reviewed by kennbuds on . CFL's and overheating?? I have a small grow box - 36x36x18" . I bought a large 125w 9600 lumens CFL with reflective hood. I also have two 42w CFL's and I cannot get the temperature below the 85-90 range (i want it around 80). These are all CFL's but I'm thinking the large 125w (this is a rather large bulb - over 12" long) might put off too much heat in this area. Would i be better off selling these 125w (I have one 6500k and one 2300k) and the hood and just hanging more 42w cfls? Rating: 5