VEVOR Dryer Vent Hose, 127MM Insulated Flexible Duct 7.62M Long with 2 Duct Clamps, Heavy-Duty Three Layer Protection for HVAC Heating Cooling Ventilation and Exhaust, R-4.2 Flame Resistance ValueProduct Features Efficient Insulation Enhance Comfort with High Loft Glass Fiber Insulation, Quieting Operation and Reducing Heat Transfer. High Quality Insulation Cotton Utilizing high loft Owens Corning insulation cotton, it reduces heat conduction while absorbing noise generated during operation, enhancing user comfort. 3 Layer Tough Built to Last with Durable Single Sided Aluminum Foil and PET, Reinforced with Fiberglass Grid for Safety and