Whilst messing around & ripping out for replacement the wooden cover that formed a cover for the old, long gone open fireplace & protruded into the next room (as a cap & general shelved area)...
I'm wondering the safety / legality of heat vent / vent vent to another room (these obviously go back to back).
Therefore what is to stop me placing an adjustable weight bearing vent that could & would allow warm air into the back room for some low level heat?
the vent would be horizontal, or would tat be a no no even with an intumeescent seal in the event of a fire outside of the cast stove?
..thought I'd delay actual work by asking this, woul;d be handy, sensible even

Or do I have to cover it over entirely in my favourite hardibacker & tile it?