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
H.B. Smith
Serial Number format: D86 2810P
(This serial number is from an actual H.B. Smith Furnace).
Using the second and third digits of the serial number D86 2810P you will find the year of manufacture. This unit was manufactured in 1986.
Year of manufacture: D86 2810P