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PerspectivePure2169 t1_ivi7k5t wrote

Reply to comment by Disarango in Sound Dampening Panels on Ductwork? by Casked_Away

There's a big tradeoff with efficiency going this route.

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Maplelongjohn t1_ivlgxup wrote

There can be for poorly installed flex duct.

However properly installed,using even a short length of flex on each branch significantly reduces sound transmission.

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PerspectivePure2169 t1_ivmx0fr wrote

I'm just about as anti flex duct as they come, but I do think this is a reasonable way to do it. It uses it where it's strengths are. I used to do HVAC design and this was common and good practice there, from a properly sized branch system, with flex from the ends to the diffusers.

As the whole duct run, as is common in residential, it's no good. It falls into the realm of things that while theoretically possible to do well, just require a level of diligence and effort that aren't going to happen the vast majority of time.

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