I need to replace the flange for my furnace flue.
The old oil furnace had a 6" flue and my replacement gas furnace has a
4" flue.The reducing flange at the chimney is rusted out and when I went to Home Depot all they had were adapters for 3" exhaust pipes.
This should be a common item but I don't seem to be able to find a replacement.
I suppose I could just make one myself I have quite a bit of heavy duty sheet metal.