4in flex duct
I am looking for some 4in flex duct like is used for the heat vents. I have found all types that are like dryer vents that have no insulation to a/c duct with too much insulation. Call me crazy but I ...
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If you want something more rigid, there is 4" semi-rigid flexible aluminum duct available at Home Depot. You can buy ordinary flexible 4" round duct from an RV parts vendor or insulated duct at Home Depot.
This is the semi-rigid type:
This is the semi-rigid type:
