What is this?

Does anyone know what this black tube is sticking out of the fire place is?

Does the unit have glass doors? or even solid metal doors?

It didn’t have any doors at all.

My guess would be that it was the part of the damper control but is missing the handle.

Tom

Damper control but the rod and handle are missing. Did you operate the damper?

Yes from inside the fireplace

To hook a vacuum to, to remove ashes.