Frequently Asked Questions
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Lennox Heating Systems
How can I confirm the model and serial numbers for my heating system?
You can find the model and serial numbers (M/N and S/N) for your furnace
by removing the top-front service panel and looking to the left side of the interior cabinet or the top of the blower deck, depending on whether your system is an 80% or 90% AFUE unit. Also, the orientation (horizontal or vertical) and flow direction (down or up) of your furnace may impact the location of the information. To view a diagram, .
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