18" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length 8in diameter purposes with snap-lock/push-open technology and

purposes with snap-lock/push-open technology and can be installed on to drywall

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

Actual Filter Size – 23 3/4"w x 25 3/4" x 1"

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

+ 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 purposes with snap-lock/push-open technology and+ 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