This is a New Box of insulated Silver/Foil Flex Ducting.  The ducting is 6" in diameter and 25' long (which can be cut into shorter sections).  The R Value is 4.2.  Insulated flexible ductwork is easy to work with and prevents condensation problems when duct is run through unfinished spaces (attics, crawls, etc). The insulated jacket also provides sound-dampening benefits to reduce fan/blower noise. Thanks for looking and good luck!

Know what you are buying!  Insulated flex ducting is rated by R Values.  The higher the R value, the better insulated the ducting, which translates into better energy efficiency and lower heating/cooling cost!  An R Value of 4.2 is considered the acceptable minimum with R 6 is being a better alternative and R 8 as top of the line.  Check out our store for a complete selection of sizes and R values!

Visit My eBay Store: NorthAmericaHVAC

Insulated: Yes

Diameter: 4-20 inches ID

Pressure rating: (WG)

Positive: 10 inches (4"-16" ID), 6 inches (18"-20" ID)

Negative: 1 inch (4"-12" ID), ½ inch (14"-20" ID)

Velocity: 5000 FPM

Temperature Range: -20ºF-250ºF cont.

Underwriters Laboratories listed for the US and Canada.

Complies with NFPA Standards 90A and 90B.

Corrosion resistant steel wire helix.

Fully lined for efficient air delivery.

The outer vapor barrier is a jacket of fiberglass scrim reinforced metallized film laminate.

*Meets UL 181 and NFPA 90A-90B Fire Codes

**GreenGuard Indoor Air Quality Certified
***GreenGuard Children and Schools Certified


On Mar-28-12 at 21:47:23 PDT, seller added the following information: