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. Mar 30, 2012 - numbers in the serial number represent the week and year. Concord - Allied Air Enterprises Inc. A Lennox International Inc. Lennox Serial Number format: 5896A 36571 (This serial number is from an actual furnace unit transcribed during a home inspection). Using the third, fourth and fifth digits of the serial number 58 96A 36571you will find the year and month of manufacture. Lennox Model Numbers Explained![]() ![]() Lennox Model SearchThe third and fourth digits are the year and the fifth digit is the month expressed in letter format. This unit was manufactured in January, 1996. Year of manufacture: 58 96A 36571 Month of manufacture: 5896 A 36571 Use the following chart to determine month. Lennox Furnace Model Number LookupWindows server 2003 x64 download. 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.
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