This is at the top of the firebox in a wood stove. Can anyone help me with the correct terminology for addressing this situation? Thanks.
The firebox is badly cracked and should not be used.
Joe nailed it…that should be all you need…imo
P.S.
A wood burning stove prevents an examination of the fireplace and flue, so we recommend a thorough examination of the fireplace and chimney by a specialist.