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"

Just snap the seam together and that's it

Compatible with 24x24 openings and built from durable

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 30" duct opening (measured at the opening)

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