Manufacture or age of an WILLIAMS furnace or other WILLIAMS HVAC equipment

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How to determine the date of production/manufacture or age of an WILLIAMS furnace or other WILLIAMS HVAC equipment.

 

The date of production/manufacture or age of an WILLIAMS furnace or other WILLIAMS HVAC equipment can be determined either from a serial number or date tag.  Formats found are:

 

Style 1:  13 AD

Style 2:  2705#####

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