12 Inch Flexible Aluminum Ducting Hose Insulated R-8.0 Air Duct Pipe for for Heavy Duty HVAC & Exhaust Ductwork Insulation - 25' Feet Long - In Accordance with UL 181

High Quality: Aluminum Housing On the Outside and on the Inside For The Best Insulation Value. Air-tight Inner Core Decreases The Pressure Loss and Provides A More Hygienic Environment- High Energy Efficient / No fiberglass erosion into air stream. Thick Blanket of Fiberglass Insulation: Which Gives You A R-Value of 8.0. Tough Reinforced Metallized Polyester Jacket Designed To withhold Bends And Sharp Turns Without Kinking.