Tubo Vertical de Canalización de Humo
(Vulcan-Hart 22RSR72 Backguard Flue Riser)

Reinforced Riser, for standard or convection ovens (if mounting a 24" cheesemelter or either of the salamanders on a back riser above the heavy duty range, you must add this)

double-deck flow-thru hi-shelf, non-overlapping, 18"

Overlapping Single-deck height riser, no shelf, 22" high, 54"