FLEXMASTER Fabriflex Type 8T Acoustical Insulated Flexible Duct offers superior acoustical insulation and durability, featuring a CPE core locked together with a corrosive-resistant galvanized steel helix. Wrapped in thick fiberglass insulation and covered with a flame-retardant, non-toxic polyethylene vapor barrier, this duct is ideal for heating, ventilating, and air conditioning (HVAC) systems. It also comes with a vinyl sleeve, ensuring long-lasting performance and effective sound dampening.