A friend recently had their open fronted inset (into old chimney breast) gas fire condemned at a service, because the room had no ventilation apart from the doors. The room has no external walls so fitting vents will be difficult. We have a similar situation but were told that because our fire is glass fronted & sealed we did not need vents fitted when we had it installed. Does our friend have any options & were we advised correctly. We have a carbon monoxide detector above the fire which has never indicated a problem & the updraft is always ok when a smoke device is placed near the test point, but I am slightly perturbed that it should never have been installed in this room.