Every effort is undertaken to offer you correct and concise information to assist you in determining the age or manufacture date of HVAC equipment. Anytime anyone is dealing with numbers and letters in determining data, mistakes and misinterpretation are bound to happen. For this reason if you find during your research that we may have erred please contact us. In addition perhaps you have come across a brand, model or serial number format that we have not addressed. Email us information or pictures of data/nomenclature plates of the unit and we will attempt to assist you in your determinations. Email
This page was last updated: 26 July 2009
Ducane
Two styles of serial numbers have been found:
Style 1
Serial Number format: 4140720328
(This serial number is from an actual furnace).
Using the seventh, eighth, ninth and tenth digits of the serial number 4140720328 you will find the year and week of manufacture. The seventh and eighth digits are the year of manufacture and the ninth and tenth digits are the week. This unit was manufactured in the 28th week of 2003.
Year of manufacture: 4140720328
Week of manufacture: 4140720328
Style 2
Serial Number format: 46 03M12345
(This serial number is fictitious).
Using the third, fourth and fifth digits of the serial number 46 03M12345 you will find the year and month of manufacture. The third and fourth digits are the year of manufacture and the fifth digit (always a letter) is the month. This unit was manufactured in December of 2003.
Year of manufacture: 46 03M12345
Month of manufacture: 46 03M12345
Use the following chart to determine month.
A = January
B = February
C = March
D = April
E = May
F = June
G = July
H = August
“I” was not used.
J = September
K = October
L = November
M = December