The sequence of letters and digits in the Lennox model number reflects specific information about the unit. On other Lennox products the plate is mounted on the outside of unit. On residential gas and oil furnaces this identification plate is located on the inside of cabinet near the vestibule panel. The model is identified by a "model number" which is stamped on the unit nameplate or rating plate. Model Numbers Each unit manufactured is a duplication of a particular model. Use of proper unit identification numbers and serial numbers will greatly help in expediting any material required for these products. Unit model number (including any dash numbers) and serial number must always be used when referring a problem to Lennox in regard to repair parts, literature, wiring diagrams, etc. 3.1 Model Numbering Systems Introduction All Lennox product is set up with a systematic coding system for both model numbers and serial numbers.
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