I finished installing my Hearthstone Phoenix and used some furnace cement on the stovepipe joints when I connected it but the adjustable elbows seem to leak a bit of smoke, a slight smell only but the Mrs. isn't crazy about the 'old woodstove smell'. I also put some furnace cement around the stove collar where the pipe goes into the stove but it doesn't seem feasible to do that with the adjustable sections. If anyone has ideas or comments they are appreciated.