Armstrong furnace

[Tom Rees]

I did a 9 plex today and 5 of the furnaces were Armstrong. The serial # was F, that's it F. The age of building is 1955. Anyone know the age of these. I couldn't find them on the normal reference I use. They all need replacement. Thanks.:D

[Eric Barker]

Can't help you with that info - doesn't correlate with the Armstrong S/N designations I have.