DuraVent DuraFlex SW 4" x 170' Stainless Steel Custom Length barrier-kit 4 *AFUE is a measurement

4 *AFUE is a measurement of the US Department of Energy

Our metal three-piece outer frames let you transition from your fireplace to the adjoining mantel or wall

Electric infrared radiant heating is practical

(1) DVL Adapter

DuraVent DuraFlex SW 4" x 170' Stainless Steel Custom Length barrier-kit 4 *AFUE is a measurementDuraFlex SW is a smooth inner wall, flexible stainless steel chimney liner. The smooth inner wall provides for no output reduction allowing for full appliance efficiency. Smooth wall construction eliminates ridges that restrict flue gas flow and collect deposits. The lack of ridges facilitates cleaning and maintenance. DuraFlex SW is ideal for relining masonry chimney for wood and gas burning appliances. Listed to UL 1777. What's Included Length