UPDATE:

I was a little concerned about heat buildup below the panel. I've been monitoring it as I used it. 2 race nights and 2 race prep sessions. (I like to show up with packs fully charged)

I measured temps with a non-contact infrared thermometer (temp gun) and noticed a 15-20 increase over ambient temperature at the exhaust outlets. Never over 100 degrees F outlet temperature. Well within my comfort zone!