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It looks like the Suburban NT-30SP has the same outside dimensions. I am putting it into a 31 1979 International coach. Does this one have to be raised up on plywood to match the external ports? I'm not sure there is 3/4" clearance on the top to fit it in there if that is the case. Can the inards of a new furnace be slid into my old shell so I get better alignment with the existing ductwork?
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