I have two fireplace in my home, on in the den and one in an upstairs bedroom(above the den). They have separate flues. The problem, when having a fire downstairs, the upstairs bedrooom "sometims" becomes smokey. First thing we did was put fireplace doors on, that helped a little but today it was smokey. Since this front room is to becomes my son's room, we won't be using the fireplace for a while. Could some one please point me in the right direction on how to remedy this problem or where to start. THANKS!