How much space between furnace and walls?
Well, it was installed by a company so I imagine the 2" was OK then? I was thinking more like 3", so I should be safe enough. My concern is the size of the newer units. Will they fit in the same area if/when I get a higher eff. rated one? It's being reinstalled on 3/4" ply floor over 2x12s, centered on 16". The flange I removed will slide nicely between the joists, but I'll need a plenum to attach the steel ductwork I'm using to, below the level of the joists..
....and dampers, and register vents, and elbows, etc...
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to see some of my original magic tricks and trick boxes!