DuraFlex Flexible Chimney Relining System

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DuraFlex SS (Stainless Steel) diy chimney liner is flexible relining for masonry chimney for use with gas, wood pellet, oil, or wood burning appliances, including: fireplace inserts, furnaces, boilers, and water heaters. Ensures safe and efficient venting of heating appliances, while protecting the masonry chimney from the damaging effects of flue product condensation. The 304 SS and 316Ti SS are designed for use with wood-burning, wood pellet, and non-condensing gas, coal, and oil appliances. Titanium is designed for harsher conditions, for more resistance to corrosion, such as coal.

DuraFlex AL (Aluminum) is flexible relining for masonry chimney for use with natural gas or liquid propane category I, draft hood equipped appliances, and appliances tested and listed to use Type B Gas Vent for a wide range of applications, including: natural gas fireplaces, gas-fired furnaces, boilers, water heaters, and wall or space heating applications. An economical venting system used for relining masonry chimney for natural gas or liquid propane category I, draft hood equipped appliances, and appliances tested and listed to use Type B Gas Vent for a wide range of applications, including: natural gas fireplaces, gas-fired furnaces, boilers, water heaters, and wall or space heating applications. Protects the masonry chimney from damaging effects of flue product condensation. DuraFlex SS and DuraFlex AL are available in 3", 4", 5", 5-1/2", 6", 7", and 8" diameters. DuraFlex carries a Limited Lifetime Warranty.

DuraFlex Install

DuraFlex Stainless Steel has a 0" clearance to masonry for gas. 1" clearance to masonry for pellet and oil applications. Insulation is required for 0" clearance to masonry.

DuraFlex Aluminum has a 0" clearance to masonry.

Be sure to select the proper liner for the application. DuraFlex Stainless Steel is used for appliances that use oil, wood, or wood-pellets for fuel; DuraFlex Aluminum is for a non-condensing gas appliance.

DuraFlex SS - OMNI Listed to UL 1777 and ULC S635 (43-P-02-2).

DuraFlex AL - UL Listed to UL 1777 (MH14420).

Typical Installations

Using the Typical Venting Installation drawings, select the appropriate component parts for your installation.

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.

Installation Key

1 DuraFlex SS Cap 8 DuraFlex Mortar Sleeve
2 DuraFlex AL Cap 9 DuraFlex AL Coupling
3 DuraFlex Top Plate 10 DuraFlex SS Connector
4 DuraFlex SS Length 11 PelletVent Pro Appliance Adapter
5 DuraFlex AL Length 12 B Vent Pipe Collar
6 DuraFlex SS Tee 13 Rigid Type B Gas Vent
7 DuraFlex AL Tee 14 Rigid PelletVent Pro

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.

Oil Furnace
DuraFlex SS
Pellet Insert
DuraFlex SS
Oil Stove
DuraFlex SS & PelletVent Pro
     
 
B Vent Manifold
DuraFlex AL
Gas Insert
DuraFlex AL
 

Also see:

Installation Instructions for DuraFlex SS Chimney Liner

Installation Instructions for DuraFlex AL Chimney Liner

DuraFlex Brochure

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