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Lennox family

How old is my Ducane equipment?

Enter the serial number from the label. The date comes from Ducane's documented serial rules, not a guess.

Look for “Serial No.” or “S/N” on the label. Spaces and dashes are fine.

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By equipment type

Questions

How do I find the age of my Ducane equipment?
Enter the serial number from the rating plate above. Ducane uses the Lennox family serial format, which includes the manufacture date.

Lennox, Armstrong Air, AirEase, Concord

Sources

Rules last reviewed 2026-09-28. These rules are in Beta while we verify more real-world examples, so results are capped at medium confidence.

Manufacture dates are decoded from manufacturer serial-number conventions and available documentation. Serial formats can change. Verify critical equipment information with the manufacturer when necessary.