Uninsulated flex duct: Does it lose its sound-dampening qualities?
I’m working on my HVAC material list. All of my branch lines are short and straight. I see where people suggest flex duct for these applications (if installed correctly) for it’s sound dampening benefits. However, I am running the ducts inside soffits, and I want the ducts as small as possible so the soffits don’t get too big. Since I am inside the thremal envelope, I don’t need insulation. Insulated flex duct adds 2-4″ to the overall duct size. I see there is un-insulated flex duct available, but I wonder if the insulation is what gives the sound benefits and whether that defeats the purpose of using flex.
The next question is whether I need to worry about sound dampening if I am using ducted mini splits?
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