Non Insulated Flexible Duct, Uninsulated Flexible Duct Manufacturer
Insulation sleeves PE 30/60/100 Ventilation ducts - Svenska Westaflex AB
Flexible ducts with insulation
Hon&Guan 4'' Insulated Flexible Duct 4 FT Long, Gray Noise Reducer Hose Silencer for Inline Duct Fan of Air Conditioner HVAC Ventilation System. - Amazon.com
Rubber-Cal HVAC 6 in. x 25 ft. Insulated-Flex Ducting Ventilation Duct Hose 01-194-6 - The Home Depot