I just went out and looked at my Lang.
The vent is centered and doesn't go any farther down than the top of the chamber.
The opening from the firebox to the cooking chamber is about 1/4 the way up the "tank" of the chamber.
Hope that helps some
Char-Broil offset, Lang 60 Deluxe and a 60gal compressor tank RF smoker in the works
Pign' Out BBQ competition team
I'm officially a ZERO
Hoping one day to become an official IMBAS Certified MOINK Baller