8" Inch Aluminum Hose Flexible Air Duct Pipe for HVAC Flex Ductwork - 25' Feet Long Supply Grille Insulation – A thick blanket

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 8

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

If your hole is 14" wide by 20" tall

R value rating of insulation - R3

The 1/2" black insulation

8" Inch Aluminum Hose Flexible Air Duct Pipe for HVAC Flex Ductwork - 25' Feet Long Supply Grille Insulation – A thick blanket+ Product Details High Quality Aluminum housing on the outside and on the inside for the best insulation value 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 metallized polyester jacket tear and puncture resistant Carefully Shrink Wrapped With