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condensing furnace noise

Timco Member Posts: 3,040
A very good friend of mine's neighbor recently had a condensing furnace installed, and it was vented to his side yard. As the unit starts up, you hear the high pitch whine of the (inducer?) motor, as well as the echo of the 3" pipe (pvc) ringing out. Is there any way for him to quite this noise, besides stuffing rags in it?

Thanks for any suggestions,

Just a guy running some pipes.


  • terry_5
    terry_5 Member Posts: 92

    too many elbows?restriction? 2inch vs 3 inch?hangers?
  • Dale
    Dale Member Posts: 1,317
    Grab the pipes

    Alot of the noise I see is a plastic pipe vibration. While the furnace is making noise grab each pipe, inlet and outlet, near the furnace and work toward the outside. The smallest item touching in the ceiling can do it. Also, this is the time for high pitched squeeks from inducer motors, so grab the inducer while it runs and see if the sound changes, new furnaces usually have a 1-5 year parts and labor warranty so whomever installed it gets to fix it.
  • Craig Bergman
    Craig Bergman Member Posts: 84
    Stuffing rags

    in the exhaust will not allow the furnace to fire.
    Please, NEVER stuff rags in the PVC pipe.

  • Timco
    Timco Member Posts: 3,040

    I was just kidding on that one....I can see where that would be bad. As a sparkey for 10+ years, I worked with a lot of 4" pvc and know what he is talking about with the echo thing. Maybe insulate around the pipes? Strap /secure them?

    Just a guy running some pipes.
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