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Noise from duct

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nsaturn
nsaturn Member Posts: 2
in THE MAIN WALL
I hear one thumping sound from the duct right about when the heating furnance blower is ready to shut down.

Any idea what this noise. Someone told me it maybe due to the vent contracing and expanding and it is normal.

Thanks-You.

Comments

  • jim lockard
    jim lockard Member Posts: 1,059
    could be

    Is this a 90 plus furnace if so could be that the vent has a little water in it that is dripping back. In which case it is normal.
  • nsaturn
    nsaturn Member Posts: 2


    Thank-You all for the quick response. I have a duct guy coming to check it out. Hopefully its not a big deal like you all said.

    Thanks again,
  • Steve M_2
    Steve M_2 Member Posts: 121
    noise

    > what you probobly hear is the duct expanding out

    > when the fan comes on, its annoying, but not much

    > to do when its in already, usually the sheetmetal

    > company will crease a "x" into the duct to

    > prevent this. thats what i have seen in the field

    > and i know the sound you are saying



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