I decided to remove the old utility chimney that came up from the basement all the way through the roof. This not only gave us extra floor space on 3 levels, but it gave me a great excuse to get a new 95% efficient gas furnace.
This shows where the old wall was. The plywood on the left is covering the hole left by the chimney. The space on the right was a built-in pantry that had an asbestos-lined heating duct running through it. Hot asbestos does not go well with Wheaties.
The new wall was pushed back 18" and now contains two ducts running upstairs.
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