14" Insulated Aluminum Flexible HVAC Duct R-8.0 – 25' Length 18in diameter 1/2" White insulation will give

1/2" White insulation will give you a good R value of 3

this flex duct decreases the pressure loss and provides a more hygienic environment

+ Product Description Introducing HVAC Premium's Aluminum Adjustable Return Grill – the key to enhanced air control and energy efficiency

The first number in a grille size represents the width

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14" Insulated Aluminum Flexible HVAC Duct R-8.0 – 25' Length 18in diameter 1/2" White insulation will give+ 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 8. 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