18" Insulated Aluminum Flexible HVAC Duct R-4.2 – 25' Length 18in diameter but you will appreciate the

but you will appreciate the benefits over the period of time

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

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The Contempo slotted Grate

Width vs Height:

18" Insulated Aluminum Flexible HVAC Duct R-4.2 – 25' Length 18in diameter but you will appreciate the+ 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