tracking down harmonic resonance mystery

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songbird wrote:

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songbird wrote: ...

FTR, i did use this method and found the line of ductwork today with the noise and hope to get down there this week to wrap a few towels around it or something to keep it from whining.
the method of using the hose to move the damper/rag down the duct was to attach the rag using duct tape at the end and then taped it again down a bit to make sure it would not come off easily (on a screw or rough edge).
took off grating, put end of hose down a little ways, walked over to where the resonance was most easily heard, put down a few feet further, etc.
second duct was it, within 5ft of the grating, which should be accessible underneath in the crawl space once i can get down there.
songbird
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Good to learn you are making progress. Sometimes these simple things take on a life of their own<g>. Let us know the final outcome.
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snipped-for-privacy@sbcglobal.net wrote:

thanks, :)
i know, pretty much every project done here involves at least three other projects along the ways. i always have a list. i will always have a list. even if it just for the sheer joy of not doing anything on it at times...
songbird
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songbird wrote:

ok, the 2nd trip under the house did not take, the whine was still there but not quite as loud and then it gradually got louder. so today before coming in i went down there again and moved the towels to another spot, where we hope it will take. before they were wrapped around the duct work and tied in place. the new spot i just crammed them in there between where the ductwork and the joists were to make sure the duct was not rubbing against the joist or the floor of the house.
much better now. third time's a charm? :)
songbird
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songbird wrote: ...

cursed, not charmed. started back up again this morning.
songbird
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