33 gallon tank
16 x 14 x 14 firebox
30" opening from firebox to CC. same for the end of the RF plate area.
2.75" inner diameter exhaust which is 24-28" in length (currently, I have it adjustable by stacking a 4" pipe on top of the existing exhaust).
The lower vent is about 8" square and the top is about 2" square. The lower vent is even with the fire grate (could this be my problem?)