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The metal firebox is lined with refractory panels that look like masonry. These panels are manufactured with high thermal properties, generally are 1/2 in to 3/4 in thick. There are four panels for the back, bottom and sides. Their purpose is to withstand the high heat of a fire, protecting the surrounding metal firebox. Without this protection, heat can transfer to the metal enclosure and cause it to warp, weaken, or worse; transfer heat to the surrounding combustibles, which is obviously a fire hazard. You don’t need a flame to create a fire, you just need an ignition point hit. Years of heat transferring to the surround wood consistently lowers that ignition point, increasing the likelihood of a house fire.
When should they be replaced?
New Refractory panels: