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 Outer dimensions: 11

+ Product Details Size - 12"w X 20"h is the size for the duct opening measurement only

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

Designed to change the vertical direction of oval duct runs

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