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Thread: Duct Noise

  1. #1
    Ben Chou's Avatar
    Ben Chou Guest

    Default Duct Noise

    Please link to Duct Noise: 20120121-003623H.wmv - YouTube

    Date & Time 2012/01/21 - 00:36 AM
    Outdoor temp: 3 degree C
    Inner temp: 20 degree C
    I heard the noise and recorded it when heating is on about 2 minutes later, but there is no noise at 5:40 - 9:50 from the scroll bar when heating is off that it may be at 7:40, and the noise appear again after 9:50.
    Can anybody tell me what cause this kind of noise?

    Thank you.

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    Certified Master Inspector CMI

  2. #2
    Join Date
    Mar 2007
    Plano, Texas

    Default Re: Duct Noise

    My guess would be metal duct work bound-up and rubbing on wood framing, etc. when the heat is on and metal is expanding then again when the heat cycles off. Just a guess though since I did not take the time to listen to the entire recording and I was not there. Call a good HVAC guy experienced in metal duct work and be prepared to tear out some sheet rock to access the problem... or just live with it.

    Jim Luttrall
    Plano, Texas

  3. #3
    Join Date
    Jun 2010
    West Chester PA

    Default Re: Duct Noise

    i would think thermal expansion and contraction
    but the recording suggests the noise occurs every 10 - 12 seconds
    i have no idea.....


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