Friend of mine has a piece of toughened glass fitted across the top of his fireplace opening to reduce the size and hence improve the draw up the chimney. It has the same effect as say a copper hood over a fire but can't be seen so easily. It's about 6" deep fixed to the fireplace across the whole width along the top of the opening.
Is this the sort of thing that could solve the problem?
Is this the sort of thing that could solve the problem?