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Can you give me the serial number? Age is defined in serial number
Do you see a number with one of the following formats?
Should be on a label inside just above burners on one of the side panels
This is an extremely old furnace.Most likely from the 60s or 70s, but we would need a serial number in one of the formats above to tell exactly.I am going to estimate in the 40 year old range. Do you have a picture or see anything else that might imply approx. age, such as when house was built and if furnace appears to be original without any ductwork adapting?
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