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Old 02-01-2013, 11:30 AM   #1
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1976 31' Excella 500
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Furnace Replacement

Does anyone have experience with inverting a Suburban SF style furnace to align the exhaust ports to an older (76) AS?
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Old 02-01-2013, 11:43 AM   #2
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Do you want to use an SF furnace because you already have it on hand? There are lots of threads about replacing 70s furnaces with the current NT-series Suburbans. Since the SF unit is a similar height to the vent itself, I don't understand why you need to invert it to use the existing vent, but you'd probably have to build a platform (as is required for a newer NT.)
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Old 02-01-2013, 12:45 PM   #3
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I believe that the SF vents on the opposite side as the NT. Ive read that the SF's are quieter with Less Amp draw and are much less expensive.
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Old 02-01-2013, 01:00 PM   #4
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I don't know about the sound level in operation, but according to Airexcel (Suburban) the amp draw is less on an NT.

NT-30SP draws 4.5 amps
SF-30 draws 7 amps

power consumption is closer in the high-BTU furnaces, but still slightly lower for the NT:

NT-40 draws 8.5 amps
SF-42 draws 9.0 amps

It looks like the SF units are slightly cheaper, but not a big difference. $10-$15 difference in the sites I checked.
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Old 02-02-2013, 08:48 AM   #5
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Thanks soo much for the info.
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