Convert to gas and direct vent.
pondman said:Yes, I must. Not enough facts given for any answer like that. Assume existing fireplace is masonary for this purpose.
A. Is it on outside wall? It must be for direct vent to work.
B. What is the size of the opening?
C. Will DV fit in that opening.
D. With all the money used to retrofit existing fireplace, just continue flu and chimney up above 2nd floor.
Just finished a 2nd story addition and did just that. Cost was about $1750