Osburn Rear Refractory slab for Stratford

This is the Rear refractory slab (brick) for the Valcourt Lafayette wood fireplace, the Osburn Stratford wood fireplace, and the Osburn Matrix 2700 wood insert. The purpose of firebricks is two-fold. Firstly, they act as insulation, holding the heat within the firebox and secondly, by protecting the outer casing of the stove from overheating, which could cause it to crack if it is made of cast iron, or distort if it is made of steel.