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    chuckey1121's Avatar
    chuckey1121 Posts: 2, Reputation: 1
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    #1

    Nov 5, 2009, 12:39 AM
    How old is my lennox oil furnace?
    Mod# of23q3/4-105/12or-6a ser # 4606m81868 thanks for the help can't get a call back from our dealers chuck
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #2

    Nov 5, 2009, 02:43 AM
    The serial # might be the key here. "4606******" suggests it was manufactured in 2006, could be 4/6/06 or 46th week of '06. Most manufacturers use this date code method.
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