15-5/8″ wide. There is some variability on the width of the furnace chambers.
Bonded silicon carbide one piece hearth plate with curb on sides and rear.
Dimensions 31.5″ (800mm) long x 15-5/8″ wide (397mm)
Overall height: 2″ (51mm)
Curb width: 0.5″ (14mm)
Curb Height (from hearth floor): 1.25″ (32mm)
Floor thickness: 0.75″ (19mm)