18" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length w20h20 Filter Size - 33

Filter Size - 33

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Design – The stick-on take-off helps you in heating

+ Product Details Size – 14"w X 36"h is the size for the duct opening measurement only

18" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length w20h20 Filter Size - 33+ 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