I’m replacing an undersized bathroom exhaust fan with a larger one that has a higher CFM.
When switching the fan out, I want to add insulation to the flexible aluminum duct that goes from the fan to the roof. The duct is roughly 3 11/32” in diameter and 10’ long.
All the articles and videos I’ve seen online on insulating ducts tends to show a plastic-like flexible duct with a fiberglass insulation wrap, which makes me wonder whether there is some issue I haven’t thought about related to adding the same kind of insulation to a flexible aluminum duct.
I was hoping someone could confirm that the same methods apply for flexible aluminum ducts, and also any recommendations for insulation to use.