Lennox®
How to determine the date of production/manufacture or age of Lennox® HVAC Systems.
The date of production/manufacture or age of Lennox® HVAC equipment can be determined from the serial number located on the data plate.
Sister or similar Brands Include: AirEase® | Airease-Johnson® | Aire-flo® | Allied-Commercial® | Armstrong Air® | Concord® | Ducane® | Lennox® | Magic-Pak®
Example serial number styles/formats found:
Style 1:Â
1606B13871
-or- Â 5899L17212
Style 2:Â Â Â Â C89274AAC
Style 3: Â Â 15A67 JA098
Style 4:Â Â Â Â 4140720328
Style 1:Â Â 1606B13871
-or- 5899L 17212
Description: Ten (10) character Serial number begins with four (4) numerical digits followed by one (1) letter and ends with five (5) numerical digits.
Year of manufacture is 3rd-4th character numerical digits
Month of manufacture is 5th character letter digit (See chart below).



Style 2:Â Â C89274AAC
Description: Nine (9) character Serial number begins with one (1) letter digit followed by five (5) numerical digits and ends with three (3) letter digits.
Year of manufacture is 1st-2nd numerical digits
Month of manufacture is 3rd character (see chart)

Style 3:Â Â 15A67 JA098
Description:Â Ten (10) character Serial number begins with two (2) numerical digits followed by a letter and two (2) more numerical digits - a space - and ends with two (2) letters followed by three (3) numerical digits
Day of manufacture is 1st-2nd numerical digits
Month of manufacture is 3rd character letter digit (See chart below)
Year of manufacture is 4th-5th numerical digits reversed.

Style 4:Â Â 4140720328
Description:Â Ten (10) digit numerical Serial number.
Year of manufacture is 7th-8th numerical digits.
Work Week of manufacture is 9th-10th numerical digits.

Page last updated: 6 June 2018