If your having problems with temps you could try a bathroom fan. I have a small one on my cab I think it's 50cfm, and my cab has similar dimensions to yours. At lowes they have them for about $15 but you might want to put a ceiling fan dimmer on it so it doesn't run full blast these things can move some air.

I googled it Broan at Lowe's: 50 CFM Bath Fan
trinitybound Reviewed by trinitybound on . 1st Go-Round - CFL's and Bagseed I had intended to keep a detailed account of this first go-round, however between my hard drive crashing and the boards being down, I'm afraid this log is going to be a little less then complete. Cab Dimensions 33.5" deep x 22 3/4 wide x 46 3/4 tall Lighting (12) 23w 5600k CFL's (Veg) (4) 42w 2700k CFL's (Flower) Rating: 5