Suggested Retail: $598.32. Master Flow - 14 FT Insulated Flexible Duct R8 Silver Jacket. The Master Flow 14 FT Insulated Flexible Duct R8 Silver Jacket is designed for standard Heating and Air Conditioning (HVAC) systems and some venting applications. It features R8 insulation, providing 50% more insulation than the standard R4.2 product for greater thermal efficiency and energy savings. This product is covered in a heavy-duty, silver jacket for durability and meets the UL181 standard as it is ETL listed. 14 FT x 25 FT x 6. DIMENSIONS ARE ESTIMATED. Brand: Master Flow. Model: F8IFD14X300-6PK. Num: e7TCHypBICTs75mYgpqXEC. Lot Sticker: OH001.04-00000017-71. 7 CALENDAR DAY FULL REFUND GUARANTEE (FROM PRIMARY PICKUP DATE) ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 CALENDAR DAY STORAGE (FROM PRIMARY PICKUP DATE) IS ALSO AVAILABLE. THE PRIMARY PICKUP DATE IS THE DAY AFTER THE AUCTION ENDS. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.