Harman Afterburner Glass For The TL200 and F200 Wood Stoves, Part # 1-00-05181
This is a small ceramic window in the back of the firebox. This window allows you to see the Afterburner Combustion System in action. This glass may smoke up under some conditions but will burn off again. It is OK if this glass is not totally clean.
If this glass cracks or gets broken you will need to replace it for the stove to operate efficiently and safely.