I had a chimney company install a new SS Metal-Fab chimney last November. Boy is that stuff expensive
! The top section of the pipe is showing signs of rust and there are small spots of rust all down the remaining sections. Odd, the worst is the South side of the chimney. Must be how the gases vent out! I called my chimney company and they are coming to look at it next week. Lifetime warranty...wonder what that means
? Hopefully they replace the top section, man it looks ugly! I know there are issues with SS and coal gases so I thought I would share my humble experience. I would ask for advice but it seems we are all in the same boat.