Nope not since about 1978 and they lasted 30 years with little maintenance..
But, some of there old furnaces were HEAVY DUTY with cast iron single burners..
What about the condenser line welded to suction line run on top of the hugh compressor. 2.0 ton Side discharge, with big coil enough to pump 60,000 btu today's units.
"Everyday above ground, is a good day".
"But everyday that you have made a difference in someones life, may insure you stay above ground a little longer".<aircooled>