18" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length 8in diameter Actual Filter Size – 11

Actual Filter Size – 11 3/4"w x 31 3/4" x 1"

+ Product Details Size - 4"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 14"w X 14"h X 2"d (for duct opening measurement only)

75" Width X 7

18" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length 8in diameter Actual Filter Size – 11+ 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