heat exchanger noise

[pa appel]

10 year old Armstrong gas forced air furnace makes a muffled boom noise 10-15 seconds before blower turns off after a heating cycle. Service man states its the heat exchanger. Company will warranty the part but not cost to replace $200-$300 labor. Have been told its not a safety issue but an asthetic one. Any thoughts on this? Thanks in advance, Jim

[Bubba]

Hey, if you want a warranty heat exchanger installed for $300 so it looks pretty.........that's up to you. Just make sure you change the thermostat and wiring to make it run more efficient. Bubba

[<kjpro]

My thoughts are "not likely"...

...it&#39;d be a new one in the book if it were true.

[Zephyr]

In the older days, heat exchangers might "oil can", but I haven&#39;t heard on doing that in many years. I&#39;d bet it&#39;s something else. Check to see if the blower wheel is tight to the shaft. Or something ....

[<kjpro]

Of coarse, his 10 year old furnace might ACTUALLY be 20+ years old.

Like the one I was told wasn&#39;t very old... less than 5 years.

Ended up being an old Brown, natural draft, Heil, with a pilot light!!!!!!!