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  • May 1, 2017, 03:29 PM
    stan k
    How old is my Heil 10, NAC048AKA4, serial number L022101372
    How old is my Heil 10 serial # L022101372? Thanks [email protected]
  • May 1, 2017, 03:56 PM
    talaniman
    manufacture or age of an HEIL QUAKERŽ furnace or other HEIL QUAKERŽ HVAC unit | Building Intelligence Center

    I get L as the decade, 02 as the year of manufacture, and 21 as the production week.

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