Dayton Furnace age

I hate asking but I called the Heil phone # and they didnt have any info on Dayton.

Dayton s/n MHMM063514
m/n FG8807512MU12A

The only info I got is " Last manufactured in 1990; seem to be out of business" hope this help a little


I sent the report and left it unknown.

I found one today that was manufactured with an 2004 or later date. I still have no idea how to date the serial number

This site is, typically, very good. But, in this instance things don’t seem to match up.