4" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length Fixed Blades providing efficient performance of up

providing efficient performance of up to 300m3/h

Actual Filter Size – 29 3/4"w x 35 3/4" x 1"

This grille enhances airflow efficiency

ventilation

4" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length Fixed Blades providing efficient performance of up+ 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