I have a Comfortmaker gas furnace in my utility room, but I cannot find the model number on the furnace. It is a very old one. I found a label with the print “Snyder General Corporation Feb 1980” on the back of the lower cover. I had no problem with the furnace in the last 10 years that I’ve lived in this home. I think it will continue to work without any big issue for some more years. But I need to know the model number to find the parts just in the case it starts to have problems. I uploaded 3 images and I hope somebody can tell me the model number of this antique.