Possible heating duct problem
I belong to a little brick bungalow in the midwest US built in 1954. Original
forced-air (galvanized ductwork) heating, 2-yr-old Heil 80% furnace.
Lying in bed, very quiet, furnace begins heat cycle. About 15 seconds after
the burners fire, I hear a big POP. Very consistently. Every night.
I know that the furnace heat makes the sheet metal expand, and a certain
amount of noise (creaks, squeaks, etc) is to be expected, but this one sounds
too loud.
Walked the length of the ductwork, tapped each joint with a mallet, inspected
everything. No apparent problem.
Still I get the big POP.
Anything with 50-year-old galvanized ductwork that I should be looking for?
Thx,
Peetie
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