Originally Posted by Pappy
It only look big because the walls are 2 3/8" thick.
The inside is 18x18-24" deep. Just the right size accourding to the smoker build calculator.
Correction: The inside dimensions of the fire box is 20x20-24 deep.
22.5 WSM, 120 Gallon Offset, Performer, UDS, IQ-110, ET-732