We are removing a Bryant Forced Air Furnace that I believe is theoriginal unit installed in the house when it was built in the early '50s. If this is the original unit, then it operated for 60 years.
I would appreciate if ayone can provide information or suggest a website that could provide information on the following unit.
This information is taken from the ID plate removed from the Furnace:
Model No: 75 385 SD
Series: B2
Serial No.: 6K 37422
Equipped for Use: Natural Gas
Input: 75000
Bonnet Capacity: 60000

Thanks for any information and your interest.

March of 1985,, just a guess looking at it as some other brands