DuraFlex Basic 4" Kit w/ Increaser Tee With Clean-Out Tee Cap - 20' - 4DF304-20K / 4PVP-T31




4DF304-20K / 4PVP-T31



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Suggested Retail $899.55 Your Low Price Special Price $809.60
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strongDuraFlex SW strong 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.


  • strongApplications: strongDuraFlex SW smooth wall flexible relining for masonry chimney. Use with gas, wood pellet, oil, or wood appliances. Applications include: fireplace inserts, furnaces, boilers, and water heaters.
  • strongMaterials & Construction: strong Single-wall .005″ overlapped 316 stainless steel (totaling .010″). Overlapped to create smooth inner wall.
  • strongClearances: strong Clearances 0″ clearance for gas, oil, and pellet applications. ” clearance to masonry for wood-burning applications. Insulation is required for 0” clearance to masonry for wood-burning.
  • strongDiameters:strong DuraFlex SW: 3″ – 12″.
  • strongListings: strong Listed to UL 1777 (MH45609).

More Information

More Information
SKU4DF304-20K / 4PVP-T31
Replaces4DF304-20K / 4PVL-T3
Included ItemsDuraFlex SS Top Plate w/welded Storm Collar, DuraFlex SS Removable Vertical Cap, DuraFlex SS Connector, and DuraFlex SW length. Flex lengths available in 20'.
TypeFlex Venting
Fuel TypePellet
Diameter4 Inches
WarrantyLimited Lifetime Warranty
Resources You will need Adobe Acrobat Reader to view PDF documents
Safety InformationPROPOSITION 65 WARNING


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