Old Suburban Furnace had an exchanger that was leaking Carbon Monoxide. (Made the sensor scream) (Darn-it, I had just spent a lot of time servicing and cleaning it of mud daubers, dirty burners and jets, lubing the fan and motor bearings, as well as removing rust scale from the bottom of the exchanger - should have known!!!) Note the angled back that fits up against the angled body. Note also the he original used a lower plenum and take offs going to the furnace outlets in the GMC. The transfer port is the rectangular hole to the right.
The problem with a new flat furnace up against the curved wall is the exhaust and intake pipes, and the wall is also used to seal the cold air return for the furnace. .
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