4" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length Compatible with Duct 8" and crafted from powder-coated stainless

and crafted from powder-coated stainless steel for exceptional durability

Easy Installation – Just pop the diffuser right into the wall duct hole and the side springs will hold it right into place so that it looks clean

Actual Filter Size – 35 3/4"w x 23 3/4" x 1"

+ Product Details Size – 28" x 28" is the size for the duct opening measurement only

4" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length Compatible with Duct 8" and crafted from powder-coated stainless+ 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