Osburn Right Refractory slab for Stratford

This is the right refractory slab (brick) for the Valcourt Lafayette & Osburn Stratford wood fireplaces. 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 fireplace from overheating, which could cause it to crack if it is made of cast iron, or distort if it is made of steel.