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Old 10-16-2012, 06:08 PM   #1
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1970 31' Sovereign
Burnsville , North Carolina
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Furnance (NT-30SP) Install Questions

Hello out there! I am installing a new Suburban NT 30SP furnace in my 1970 Sovereign. Thanks to the many forum posts about this subject, I have modified the old plenum and about ready to install the unit. I have 3 questions: (1) do I have to fabricate a new metal cabinet to replace the old one which was not deep enough, (2) do I close off the three open, round, duct holes, and (3) what do i do about the 1/4" air space between the bottom of the unit and the top of the plenum? See photos below. Thanks, Bill
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Old 10-16-2012, 07:42 PM   #2
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1974 27' Overlander
Sault ste Marie , Ontario
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Given that a picture or two are worth a lot of typing, attached is how I did mine. I blocked all the side holes with a sheet of aluminum held in place with rivets, You shouldn't need to build a cabinet over it as it would restrict airflow to the furnace. The pictures show how I modified the old furnace front cover and plenum to take the new one. It works well, lots of hot air.What is the shiny stuff with the red writing on it?....Phil
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Old 10-16-2012, 07:53 PM   #3
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2014 20' Flying Cloud
Kooskia , Idaho
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I don't understand quesiton #1 about a new cabinet. The new furnace comes with a new cabinet already.

Yes, you want to close the round holes as all of your air wants to go down to the old ductwork. The round holes are for a different duct system type.

I would use sticky aluminum tape to seal off the area of the gap from the furnace to the old ductwork.
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Old 10-16-2012, 10:34 PM   #4
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1970 31' Sovereign
Burnsville , North Carolina
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Dear Phil and idroba,
Thanks for answering my questions and providing photos. The shiny stuff with the red writing is heavy duty HVAC foil tape that I bought from a heating and plumbing store. It's about twice as thick and sticky as the basic aluminum tape. I was concerned about the "cabinet" because the old furnace cabinet was solid and the new one has lots of slots in it. Anyway, thanks to you guys, I am ready to install!!
Bill
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Old 10-16-2012, 10:35 PM   #5
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1970 31' Sovereign
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p.s. to Phil,
Nice job on your furnace!
-Bill
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