18" Insulated Aluminum Flexible HVAC Duct R-4.2 – 25' Length Supply Grille 1/2" White insulation will give

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

this coil exceeds the required 700 PSI for R410 with a pressure rating of 2300 to 6500 PSI

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18" Insulated Aluminum Flexible HVAC Duct R-4.2 – 25' Length Supply Grille 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 4. 2 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