Grimsby furnace age

Specific Inspection Topics Inspecting HVAC Systems
1

Can anyone tell me the age of this beast?
Natural Gas Grimsby furnace model GLS80.

Thanks,

2

Patrick

Next time you run across one of these, look for a Date Code.

A = 1950’s
B = 1960’S
C = 1970’S
D = 1980’S
E = 1990’S

Date code B4 = 1964

Joe