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Originally Posted by wacnstac 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? |
Maybe.............
You have to look at teh 2 units side-by-side and be sure that the planum chamber (where the heating of the intake air takes place) fits in exactly the same place to assure that it will line up properly with the existing ducts.
Also, look into the installation manual and be sure that the duct area meets the minimum required for the new furnace. (Pi-R squared, ya know),
or you have a potential overheating situation with insufficient output area to the ducts.