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Old 05-07-2014, 06:40 AM   #1
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1975 31' Sovereign
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Suburban NT30SP Hot Ductwork

I just replaced the old Suburban NT32 furnace in my '75 Sovereign with a new NT30SP. The furnace works great but I am concerned that the ductwork gets so hot, too hot to touch. I replaced the ductwork with new aluminum flex identical to what was originally installed. I am also adding a 4th 4" round as recommended by a lot of Forum readers.

Should I replace the duct with insulated duct?

Ken
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Old 05-07-2014, 07:30 AM   #2
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No, its just working good.
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Old 05-07-2014, 11:34 AM   #3
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Adding a 4th duct will drop the temperature about 20 degrees.
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