In CT, the main duct work is solid rectangular, the offshoots are the flexible type.
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8 years ago
Additional return duct addition cost
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8 years ago
It does have higher restriction, exactly how much IDK. But that can be made a non-issue by correctly sizing it. Noisier, I strongly doubt. I've seen it used in many new houses, and there is no noise. If anything, you'd think the nature of it's construction would tend to absorb noise. And it sure doesn't have the bang noise that aluminum duct work can have when the blower starts up.