Well with the 4" fan the temps got up to 86 degrees. Keep in mind that this is a MH conversion bulb. They get hot! My last readings were from a 400W HPS. I've read that MH bulbs get hotter than HPS bulbs.

I just went out and purchased an ActiveAir 465cfm fan. I took off the carbon filter completely and the temps are staying at 82 degrees. 265cfm more and a 4 degree drop. I was hoping for more.

Is there anything I am missing here? Ambient room temp is 75 deg. With a big ass fan like this is the 7 degree increase reasonable?

These fans aren't easy to mount. There are no hanging tabs at all.