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The trick to HVAC isolation is not having a clean path in or out for the sound.
Interesting thought... Sound is movement of air, so at first thought bends in the duct should not make that much difference. But, bends increase resistance to air flow so I suppose that is the mechanism in play.

I would think that fiberglass lining inside the duct would be important to air flow noise - does flex duct have that, or is the insulation on the outside?
 
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