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Old 10-23-2013, 05:33 PM   #1
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How to tell age of furnace

Is there a way to tell the age (or year of manufacture) of a Suburban furnace by it's serial number?
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Old 10-23-2013, 05:43 PM   #2
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This post lists ranges of serial numbers that were involved in the recalls and were manufactured in the '60s and '70s.

Inside the front cover of my NT-22 there's a plate that has the serial #. I don't have a great picture of it, but it looks like there's a slash on one of the lines, perhaps that's a manufacturing date? I'd have to look at it up close to be sure, but with the front cover off a '74-'75 NT-22 looks like this:

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Old 10-23-2013, 05:51 PM   #3
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The one I am interested in finding the age of has a 9 digit serial number and is an NT 30SP. The sticker on it says it conforms to 1998 specs, so it is at least that new.
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Old 10-23-2013, 05:58 PM   #4
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Ah, I made the invalid assumption that it was an old one in you Argosy24.

Their website says that 9-digit serial numbers started in 1990, and I agree with you that the "1998 specs" statement suggests it was made after '98.
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Old 10-23-2013, 06:51 PM   #5
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After I saw your first reply I realized I needed to include more information to get the kind of answer I was looking for. Sorry for that.
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Old 10-25-2013, 03:52 PM   #6
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I emailed Suburban customer service and found out that my furnace, serial number 011203073 was manufactured in 2001. So if anyone has a larger serial number yours is newer.
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