With solid fuel a lot of the heat comes off the flue pipe which normally helps to heat the room.
Could it be that it has been boxed in to hide the flue and vents put in to allow the flue to still heat the room? They do look like heat marks to me.
Could you not pull one of the vents off to take a look?
However if there is any doubt I would get someone to take a look, it is always a good idea to have a detector whatever the outcome.
Could it be that it has been boxed in to hide the flue and vents put in to allow the flue to still heat the room? They do look like heat marks to me.
Could you not pull one of the vents off to take a look?
However if there is any doubt I would get someone to take a look, it is always a good idea to have a detector whatever the outcome.