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Thread: Duct Noise
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02-13-2012, 02:01 AM #1
Ben Chou Guest
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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02-13-2012, 07:25 AM #2
Member
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- Mar 2007
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- Plano, Texas
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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.
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02-13-2012, 07:49 AM #3
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- Jun 2010
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- West Chester PA
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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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