Here is what i got Dan
Fedders
Capacity: Last two digits of the model number indicate 1000s of Btus
Example: CF30 = 2.5 ton
Age (through 1977): Last two letters of serial number
indicate month & year beginning with September 1966
Note: I not used
A=Sept
B=Oct
C=Nov
Etc.
A= 1966
B=1967
C=1968
Etc.
Example: xxxxAA = September 1966, xxxxBC = October 1968
Thanks guys. Obviously FEDDERS is a little short on helping ID their product. Model Numers immediatelt told me size BUT age I couldn’t get hold of in my Carrier Blue Book; Preston Guide; or by Googling.
Ended up just telling BUYER, the age is unknown. Verify with the seller or a FEDDERS dealer.