4" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length 4" Round Duct Pipe actual front end outer dimensions

actual front end outer dimensions are approximately 30 5/8" width X 12 5/8" height

A Uniquie Combination of Cotton & Synthetic Fibers Gives You The Most Filtration And The Least Air Resistance - Equals Great Air & Easy Airflow For Your System

Adjust the airflow to your preference by simply opening or closing the top panel

supported by sturdy connectors

4" Insulated Aluminum Flexible HVAC Duct R-6.0 – 25' Length 4" Round Duct Pipe actual front end outer dimensions+ 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