I can't really get the intake from anywhere else unfortunately. I rent the property so minimal destruction is best. Altough I've considered buying a cheap door so I can beat on it...

I've got to admit that it's slightly discouraging to see that you're using a 6" 440cfm with a 250 watt and you're at 2 degrees above ambient (you're setup is awesome btw). Considering I'm at 170cfm with a 400 watt I'm thinkin' I've got quite the challenge ahead of me lol. Humidity isn't much of an issue here at the moment. How exactly does humidity affect temperature? Seems like it lowers the temp a bit...

As we speak I'm re-testing the grow cab after moving the ballast out of the room and re-positioning the filter directly above the light. I will post temps and pictures after it's all finished.

Thanks!

~GG