4 Inch Insulated Flexible HVAC Duct 25 ft

Insulated 4-inch flexible HVAC duct was a 25 foot roll. I used about 6 foot however there isn’t a 19 foot piece left. I think there is a six or 7 foot piece and probably a 10 to 12 foot piece . It has an R4 fiberglass insulation layer and an aluminum foil core for ventilation and exhaust. The exterior is a black seamless polyethylene jacket. This Class 1 duct includes a steel wire helix for structural support. This item was $100 with tax.