Yes,brick lined on btm and three sides ,standard 1 1/8" bricks slide in angle iron rail.
There is a 10" baffle at the top just befor the flue outlet. This was all black at one time, the hot areas just got lighter in color.
I have one, bought new in 1983 from Tucker stoves. Still in great condition. Burning 4 cord per year for the past 25. Mine does not have the heat...
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