Everbilt | sku: 246665 Everbilt 4 In. X 25 Ft. Flexible Foil Duct Everbilt 4 in. x 25 ft. Flexible Foil DuctConstructed Of Heavy-Duty, Fire Resistant, Aluminum Foil LaminateConstructed With A Corrosion Resistant, Wire HelixDuct Is AirtightWill Not Support CombustionNote: Per Ul2158a Only Ducts 8 Feet Or Less Can Be Ul... Log in for pricing