4" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length Fixed Blades Actual Filter Size – 29

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

+ Product Details Size - 36"w X 6"h is the size for the duct opening measurement only

This grille enhances airflow efficiency

actual front end outer dimensions are approximately 32 5/8" width X 16 5/8" height

Actual Filter Size – 7 3/4"w x 5 3/4" x 1"

4" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length Fixed Blades Actual Filter Size – 29+ 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