Need help with Lennox mfg date

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I don’t know why the picture didn’t upload on my original post

Same furnace

Looks to be Pre 1974.

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The G9 Furnaces were made from '69 to '72. You have to call Lennox to see the exact year. (800) 953-6669. You can also submit the info at aircomfortexperts they have antique manuals, they will know too.

age: beyond EOL