Not sure how you install a fire place IN a wall, our house is concrete block (outside walls) and interior walls are around 4 inches. There are several fire place furniture type that are mounted AGAINST the existing wall. If I misunderstood sorry, otherwise you may want to clarify. The units I mentioned typically do not require any special installation except possibly a receptacle to plug in the unit.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV.
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