What is the experience with flexible ductwork for residential use?? I’m talking about the type with a mylar liner and ‘slinky-like’ wire inner core surrounded by approx. 1″ fiberglass insulation and outer polester/mylar wrap. Talking about comparison to rigid sheet metal duct. Also looking only at use in branch ducts, the main (trunk) ducts remain as sheet metal.
Some advantages: Noise deadening (quieter) Insulated Continuous inner liner
Disadvantages: Higher resistance to air flow.
Also, doesn’t seem that there is a good technique for flexible to round sheet metal duct connections. Mfrg recommends duct tape which I wonder how long before it dries out.
Looking for real-world experience (good or bad).