FireFlex 316L Flexible Chimney Liner Tee Kit

The FireFlex 316L Flexible Stainless Steel Chimney Liner Tee Kit provides a durable, corrosion-resistant venting system for relining existing masonry chimneys. Its flexible construction helps installers navigate bends, offsets, and irregular flue passages that can make rigid liner installation difficult.

Each complete chimney liner tee kit includes a flexible 316L stainless steel liner, top plate, square-top chimney cap, and a tee with an EZ Connect clamp and bottom cap. The system is suitable for approved wood, pellet, oil, and gas appliance applications and is backed by a transferable lifetime warranty.

FireFlex 316L Chimney Liner Tee Kit Features

• 316L Stainless Steel Construction: The flexible liner is manufactured from corrosion-resistant 316L stainless steel for dependable performance in demanding chimney environments.
• Flexible for Bends and Offsets: The liner can navigate many irregular or offset masonry flues more easily than rigid chimney liner sections.
• Complete Tee Kit: The kit includes the flexible chimney liner, top plate, square-top chimney cap, tee with EZ Connect clamp, and bottom cap.
• Multi-Fuel Compatibility: Suitable for approved wood, pellet, oil, and gas appliance installations when properly sized and installed.
• Transferable Lifetime Warranty: The chimney liner is backed by a transferable lifetime warranty, subject to the applicable warranty terms.
• Designed for Masonry Chimney Relining: The flexible liner creates a continuous venting pathway through an existing masonry chimney.

What Is a Flexible Chimney Liner?

A flexible chimney liner is a continuous stainless steel venting system installed inside an existing chimney. It provides a defined pathway for combustion gases to travel from the appliance connection to the chimney termination.

Flexible liners are commonly selected for masonry chimneys with bends, offsets, or irregular interior dimensions. Their construction allows them to follow chimney configurations that may be difficult to navigate with rigid liner sections.

Why Choose 316L Stainless Steel?

316L stainless steel provides excellent resistance to corrosion in chimney environments where moisture, acidic condensates, and combustion byproducts may be present. This makes it a versatile material for approved wood, pellet, oil, and gas venting applications.

The material combines corrosion resistance with the flexibility required for chimney relining projects. Proper appliance compatibility, liner sizing, insulation, and installation must always follow the appliance manufacturer’s requirements and applicable codes.

Chimney Liner Tee Kit Specifications

Product type	Flexible stainless steel chimney liner tee kit
Liner material	316L stainless steel
Liner construction	Flexible
Primary application	Existing masonry chimney relining
Compatible fuel categories	Wood, pellet, oil, and gas
Appliance connection	Tee with EZ Connect clamp and bottom cap
Chimney-top components	Top plate and square-top chimney cap
Warranty	Transferable lifetime warranty, subject to warranty terms

What Is Included in the FireFlex Tee Kit?

• FireFlex 316L flexible stainless steel chimney liner
• Top plate
• Square-top chimney cap
• Stainless steel tee
• EZ Connect clamp
• Tee bottom cap

What Is a Chimney Liner Tee Used For?

A chimney liner tee creates the horizontal connection between the vertical liner and the heating appliance or connector pipe. It is commonly used when a stove, insert, furnace, boiler, or other approved appliance connects through the side of a masonry chimney.

The bottom cap closes the lower opening of the tee. The EZ Connect clamp helps secure the tee connection to the flexible chimney liner.

Compatible Appliances and Applications

The FireFlex 316L Chimney Liner Tee Kit is designed for approved chimney relining applications involving compatible appliances and fuel types.

• Wood stoves
• Pellet stoves
• Fireplace inserts
• Oil-fired furnaces
• Oil-fired boilers
• Approved gas appliances
• Existing masonry chimney relining
• Chimneys with bends or offsets
• Side-entry appliance connections requiring a tee

Always confirm that the selected liner material, diameter, insulation system, and connection components meet the appliance manufacturer’s venting requirements.

Why Reline a Masonry Chimney?

A stainless steel chimney liner creates a continuous venting pathway inside an existing masonry chimney. Relining may be required when the original flue liner is damaged, deteriorated, improperly sized, or incompatible with a new heating appliance.

The correct liner can help contain combustion gases and support proper appliance venting. Liner selection and installation should be based on the connected appliance, chimney condition, fuel type, required diameter, and applicable building codes.

Flexible vs. Rigid Chimney Liners

Flexible Chimney Liner	Rigid Chimney Liner
Can navigate many chimney bends and offsets	Best suited to straight or consistently aligned flues
Installed as a continuous liner section	Installed using connected rigid sections
Commonly used for existing chimney relining	Often selected where a straight installation path is available
Can simplify installation in irregular masonry chimneys	May require additional access or alignment through offsets

316L vs. 304 Stainless Steel Chimney Liners

316L Stainless Steel	304 Stainless Steel
Excellent resistance to corrosion	Good general corrosion resistance
Commonly selected for multi-fuel applications	Commonly used in approved solid-fuel applications
Greater resistance in environments involving acidic condensates	Suitable for applications approved by the liner and appliance manufacturer
Compatible with approved wood, pellet, oil, and gas systems	Compatibility depends on the specific product and appliance requirements

Choosing the Correct Chimney Liner Size

The liner diameter must match the venting requirements of the connected appliance. An improperly sized liner can affect appliance draft and venting performance.

Before ordering, confirm:

• The appliance flue-collar diameter
• The appliance manufacturer’s required liner size
• The available space inside the chimney
• The chimney height and installation path
• The location and size of chimney offsets
• Whether liner insulation is required
• The tee and appliance-connector configuration

Do not reduce or increase the liner diameter unless permitted by the appliance manufacturer and applicable code requirements.

Chimney Liner Insulation

Some installations require chimney liner insulation to meet listing, clearance, or performance requirements. Insulation selection depends on the chimney condition, appliance, fuel type, available flue space, and installation method.

Confirm whether insulation is required before ordering the liner kit. Fireside Chimney Supply also offers pre-insulated chimney liner systems for projects where factory-installed insulation may simplify installation.

Installation Overview

Inspect and measure the chimney before installing the flexible liner. Confirm that the liner can pass through the full chimney length, including all bends, offsets, and narrow areas.

The liner is typically lowered or pulled through the masonry chimney and connected to the tee at the appliance-entry point. The top plate supports and seals the liner at the chimney top, while the square-top chimney cap helps protect the liner opening from precipitation, debris, and wildlife.

Installation must follow the FireFlex instructions, appliance manufacturer’s requirements, applicable listing requirements, and local building codes. Professional installation is recommended when the installer is unfamiliar with chimney relining, venting systems, or rooftop work.

Safety and Performance Considerations

The chimney liner must be correctly sized, connected, supported, and terminated for the specific appliance. The chimney should also be inspected and cleaned before installation so hidden obstructions, damaged masonry, creosote deposits, or clearance concerns can be addressed.

A chimney liner alone cannot correct every drafting, appliance, or chimney-condition problem. Proper performance depends on the complete venting system, including the appliance, connector, liner diameter, chimney height, combustion air, and installation conditions.

Transferable Lifetime Warranty

FireFlex stainless steel chimney liner tee kits are backed by a transferable lifetime warranty, subject to the current warranty requirements, exclusions, inspection requirements, and installation conditions.

Review the complete warranty before installation and maintain the chimney system according to the appliance and liner manufacturer’s requirements.

Why Choose the FireFlex 316L Tee Kit?

• Corrosion-resistant 316L stainless steel liner
• Flexible construction for bends and offsets
• Complete tee connection system
• Top plate and square-top chimney cap included
• Compatible with approved wood, pellet, oil, and gas applications
• Designed for existing masonry chimney relining
• Transferable lifetime warranty

FireFlex 316L Chimney Liner Tee Kit FAQs

What is a chimney liner tee kit?

A chimney liner tee kit includes a flexible vertical chimney liner and the components needed to create a horizontal appliance connection through the side of a masonry chimney.

What comes in the FireFlex tee kit?

The kit includes the flexible 316L stainless steel chimney liner, top plate, square-top chimney cap, tee with EZ Connect clamp, and tee bottom cap.

Why is the liner made from 316L stainless steel?

316L stainless steel provides excellent resistance to corrosion and is suitable for approved multi-fuel chimney applications where moisture and acidic condensates may be present.

Can the liner navigate chimney offsets?

The flexible construction is designed to navigate many bends and offsets found inside existing masonry chimneys. Measure and inspect the complete installation path before ordering.

Can this liner be used with a wood stove?

Yes, when the liner size, insulation, and installation comply with the wood stove manufacturer’s venting requirements and all applicable codes.

Can this liner be used with a pellet stove?

The supplied product information identifies pellet appliances as a compatible application. Verify liner sizing, venting configuration, and installation requirements with the pellet appliance manufacturer.

Can this liner be used with oil appliances?

Yes, for approved oil appliance applications. Confirm the required liner diameter, connector arrangement, and installation requirements before ordering.

Can this liner be used with gas appliances?

The liner may be used with approved gas appliance applications when the material, diameter, and venting configuration meet the appliance manufacturer’s requirements.

What is the tee bottom cap used for?

The bottom cap closes the lower opening of the tee after the horizontal appliance connection is installed.

What does the top plate do?

The top plate supports the liner at the chimney top and helps close the opening around the liner termination.

What does the square-top chimney cap do?

The chimney cap helps protect the liner termination from rain, snow, debris, birds, and other wildlife while allowing combustion gases to exit.

Does the liner need insulation?

Insulation requirements depend on the chimney condition, appliance, fuel type, listing, clearances, and applicable codes. Confirm the requirements before ordering or installing the liner.

How do I choose the correct liner diameter?

Follow the connected appliance manufacturer’s specified vent diameter. Also confirm the available chimney space and any insulation requirements before selecting the liner size.

Can a homeowner install this chimney liner?

Chimney relining requires accurate sizing, safe rooftop access, proper appliance connections, and compliance with venting and building-code requirements. Professional installation is recommended when the installer lacks chimney-system experience.

Does the FireFlex liner include a warranty?

Yes. The liner is backed by a transferable lifetime warranty, subject to the current warranty terms and installation requirements.