11-1/2″ wide. Check your furnace dimension and make sure you order the correct hearth plate. If your furnace is wide enough you may want item 26460H which is 11-3/4″ wide. There is some variability on the width of the furnace chamber.
Bonded silicon carbide one piece hearth plate with curb on sides and rear.
Dimensions 19.25″ (489mm) long x 12″ wide (304mm)
Overall height: 1.5″ (38mm).
Curb width: 0.5″ (13mm)
Floor thickness: 0.625″ (16mm)