8" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length Compatible With Duct 4in the second number represents the

the second number represents the length

+ Product Details Size – 12"w X 36"h is the size for the duct opening measurement only

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Ensure all connections are secure and insulated properly to prevent short circuits

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8" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length Compatible With Duct 4in the second number represents 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 6. 0 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