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Refer to our Typical Venting Installation drawings to select the appropriate component parts for your installation.


  • The inner pipe diameter should match the outlet size of the appliance.
  • Check the appliance manufacturer’s installation instructions to confirm which types                                                                     of vent configurations are permitted (i.e. horizontal, vertical, chimney reline, etc.).                                                                     Also, check for any venting restrictions such as maximum horizontal run, minimum and                                                                     maximum vertical rise, maximum offset, etc.
  • Be fire safe! Use proper support and bracing. Follow local building codes and have your                                                                     venting system inspected.



More Typical Installations:

DuraFlex Typical Installations

Installation Key
1 DuraFlex SS Cap
2 DuraFlex AL Cap
3 DuraFlex Top Plate
4 DuraFlex (SW, Pro, 304, 316) Length
5 DuraFlex AL Length
6 DuraFlex SS Tee
7 DuraFlex AL Tee
8 DuraFlex Mortar Sleeve
9 DuraFlex AL Coupling
10 DuraFlex SS Connector
11 PelletVent Pro Appliance Adapter
12 DuraBlack Trim Collar
13 Rigid Type B Gas Vent
14 Rigid PelletVent (L Vent)
15 ProFoil Insulation, AluFoil Tape & ProMesh
16 DVL or DuraBlack Pipe
17 Pipe Collar (B-Vent)

Planning Your Installation:

1 Verify the venting requirements of the appliance used. Choose the liner system appropriate for the appliance and installation.
2 Refer to the Typical Installations for the type of liner installation similar to your situation. Identify the needed parts for installation.
3 The size of the liner should match the outlet size on the appliance or the size of the vent/manifold that penetrates into the masonry chimney.
4 Determined the length of the liner needed.
5 Make sure of a proper fit for the Top Plate of the reliner to provide a secure, leak-proof installation.
6 If a free-standing appliance is used, select the vent or stovepipe pieces to connect from the appliance to the liner (refer to the appropriate section of catalog).
7 Important! Check to be sure the installation complies with all local and national code requirements, including clearance to combustibles. Contact the local building inspector for permit requirements.

Design Recommendations

  • The following design recommendations are intended only as a general guideline to assist in the design and selection of liner components for your installation. Always read and follow DuraVent Installation instructions (enclosed with the cap or support                 box) before installing DuraFlex. Installation instructions can be viewed online at www.duravent.com, under catalogs and instructions.
  • Before relining a chimney, it should be cleaned and inspected to verify the integrity of the mortar and masonry. In addition, have a certified chimney professional determine if the masonry was constructed with 0” or 1” clearance to the surrounding combustibles. This is an important fire safety issue that may have an influence on how the liner is installed.
  • Be sure to select the proper liner for the application. DuraFlex SS is used for appliances that use oil, wood, or wood-pellets for fuel; DuraFlex AL is for a non-condensing gas appliance. Refer to the appliance manufacturer for installation requirements affecting venting. Keep the vent path as straight as possible for best performance.




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