4" Inch Aluminum Hose Flexible Air Duct Pipe for HVAC Flex Ductwork - 25' Feet Long Supply Grille these pipes offer easy handling

these pipes offer easy handling

And is classified as Class 1 Fire Proof - B1

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The 1/2" black insulation

4" Inch Aluminum Hose Flexible Air Duct Pipe for HVAC Flex Ductwork - 25' Feet Long Supply Grille these pipes offer easy handling+ Product Details High Quality Aluminum housing on the outside and on the inside for the best insulation value Energy Efficient Air tight inner core decreases the pressure loss and provides a more hygienic environment high energy efficient No fiberglass erosion into air stream Design Designed to withstand bends and sharp turns without kinking. Tough reinforced metallized polyester jacket tear and puncture resistant Carefully Shrink Wrapped With