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Furnace smell, suspect HX
32 year old Comfortmaker condensing furnace.
Customer complained of a smell. Of course with the age of this thing the first thing you think of is the HX.
They have carbon monoxide detectors installed on every floor. One of my tricks is to put a plastic baggie over the air intake pipe and one over the flue pipe taped on and with the burners off of course start and stop the blower motor and look for any movement in the plastic bags....they didn't move.
Combustion tested and was ok
Got any other tricks??