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The insulated flex duct is a lot easier to install. but...
It comes in 2 forms. Foil on the outside only and foil on the inside and outside. Obviously, inside/outside is better. In both cases, the ducts are better traps for dust than hard duct. The unlined duct can also pickup moisture, which can lead to mold.
These ducts are common in newer construction because the labor to install is much less.
Insulated hard duct is better since it doesn't collect tons of dust and is easier to clean. It is much more expensive and much more labor intensive to install.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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