My furnace and water heater are both gas-fired. They feed into this single wall galvanized removable section with inlets for both. The riser appears to be double walled. It is of '50s vintage and not "Type B", which I believe might be required, as the furnace was installed 2 years ago and the installer used Type B duct to connect to this. I'm guessing there are sections with 6" and 3" inlets that can be connected up, as well as an endcap to make up another comparable fitting. Is this the way to go or are there alternatives? Where can I find this stuff locally, HVAC shop or Plumbing supply? It would actually be more convenient to have an on-line source.
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