Attached are pics of a Rheem Imperial Drum 90 furnace heat exchanger. This unit is from the 90's and from what I hear there have many problems with this heat exchanger. The unit is sealed and there isn't even a glimpse of the HX. Obviously, the drum was overheated big time. The furnace had been replaced by a HVAC contractor last year after the owner had repeatedly had the unit "repaired" by the local gas company under their warranty program "Worry Free", which BTW doesn't cover the HX. The gas tech replaced circuit boards many times because the furnace shut down. They never even dissasembled the unit the to check under the hood! The owner's elderly mother died of other causes before this was replaced, but had some strange, undiagnosed bloating. The caretaker had collapsed in the house, but it was attributed to dieting! The owner did have CO detectors. BTW, the Rheem Criterion? 80% furnace in the attic had the characteristic cracked plastic inducer fan housing and the flue was disconnected from the inducer housing because the flange was broken off. The hot surface igniter had just been replaced, and the furnace had just been given the AOK! I'm not sure what my point is, but the owner was thankful and now even more peeved at the furnace guys. Download Attachment: Morristown 001.jpg 36.28 KB Download Attachment: Morristown 002.jpg 42.32 KB Download Attachment: Morristown 003.jpg 30.74 KB