Yesterday my fan and carbon unit came in. Man, these bitches are big time. WAY later than I imagined. Very professional looking, very solid. HTG Supply WIN. Just in time, as last night I switched her to 12/12. The fan and carbon unit are OVERKILL for my size tent, but I like it that way.
I can upgrade to a bigger tent one day and keep the same size fan. I also like keeping the fan on the LOWEST it will go, and watching in enjoyment as the sides of the tent completely implode from the negative pressure (so much so it's touching the lights coming off on the Y splitters, fixing that today).
The entire unit fits rather snug in the top of the cab, with no sharp bends in the duct work or anything. It's brought down my temps, and finally staying right at 80 degrees, closed up, with 292 watt's of CFL's in it (6-42 watt).
Shot of the top of the tent, looking from the ground.