18" Insulated Aluminum Flexible HVAC Duct R-4.2 – 25' Length 18in diameter Width vs Height:

Width vs Height:

All steel wire is applied between PET surfaces to prevent corrosion (oxidization)

Solid Rigid Steel Body For Durability and Reliability

but you will appreciate the benefits over the period of time

18" Insulated Aluminum Flexible HVAC Duct R-4.2 – 25' Length 18in diameter Width vs Height:+ Product Details High Quality Aluminum housing on the outside and on the inside for the best insulation value Insulation A thick blanket of fiberglass insulation provides you with an R Value of 4. 2 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