Looking at setting up an ash vac system for my father/mother in law in their fire place. Been searching here and looking around and don't really see any vacs that says it's OK for hot coals. I was thinking of using a sealed metal barrel inline between the stove and the vac to hold the majority of debris between the fireplace and ash vac. My shop dust filter uses the same premise. That way, any hot coals accidentally sucked up would stay in the inline barrel. They have a pretty neat custom made system. the fireplace has a large firebox that has a door in the back so it can be fired from the unfinished side of the basement. The front has glass doors facing the living room. The whole ash aparatus can sit in the room behind fireplace.