16" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length Oval to Round 90-Degree Boot + Product Details Size –

+ Product Details Size – The size 30-gauge stick-on collar is 6" and it is compatible with duct 6"

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

+ Product Details Size - 28"w X 24"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 20 5/8" width X 22 5/8" height

+ Product Details Size – 4"w X 8"h is the size for the duct opening measurement only

16" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length Oval to Round 90-Degree Boot + Product Details Size –+ 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