Serial marriage

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Serial numbers are usually issued during a particular year, so contacting Lennox dealers can get you closer to the model.

5. Call 1-800-537-4341 and have the serial number ready.

http://www.mclaughlin-air.com/lennoxpressrelease1.htm

http://letmegooglethatforyou.com/?q=lennox+serial+identification

www.heatpro.us energy businessmen's knowledge

Yes, you really have to find out the MAKE and MODEL to get good answers. There IS more than one machine made.