Chimney inner sleeve WADEX 125 mm diameter model 125120130

The WADEX chimney inner sleeve with a 125 mm nominal diameter (model 125120130) is an internal lining component intended for use in chimneys and flue systems. It provides a smooth passage for combustion gases, protects masonry from high temperatures and corrosive by-products, and helps maintain draft stability. The sleeve is suitable for retrofit, repair, or relining of existing chimneys where a 125 mm liner is required and is designed to be used with compatible connectors, seals and other chimney system accessories.

Advantages

The inner sleeve offers a durable internal surface that resists heat and common combustion residues, reducing deterioration of the surrounding brick or concrete. Its standardized nominal diameter ensures compatibility with commonly used connectors and sealing materials for 125 mm systems. Installation of the sleeve contributes to safer flue operation by improving gas flow and helping to prevent leakages into the building structure when correctly sealed and joined.

Suitable for

• Relining existing chimneys and flue passages with a 125 mm internal diameter
• Repairing damaged or eroded chimney liners to restore safe operation
• Adapting masonry chimneys for use with small solid fuel appliances or gas/oil burners that require a 125 mm flue
• Use in retrofit projects where a low-profile, internal liner is required

Key specifications

• Nominal internal diameter: 125 mm
• Intended application: chimney and flue liner for exhaust gases
• Function: protects masonry from heat and combustion by-products; provides smooth flue path
• Compatibility: suitable for use with standard 125 mm connectors and sealing materials
• Typical installation: internal lining for masonry chimneys and flue shafts

How to use

Measure the chimney or flue shaft to confirm the 125 mm nominal diameter is suitable and check the condition of the chimney for structural soundness. Prepare the flue path by cleaning out loose debris and soot. Insert the inner sleeve into the chimney shaft, using compatible connectors and seals to join sections and close gaps. Ensure all joints are properly sealed and supported according to local building regulations and manufacturer guidance. After installation, perform a smoke or draft test to verify correct gas evacuation and check for any leakage.

Usage recommendations

Use only components and sealing products rated for chimney temperatures and fuel type. Follow local building codes and, where required, have the installation inspected or carried out by a qualified technician. Regularly inspect the liner for soot build-up or damage and schedule cleaning or maintenance according to appliance and fuel manufacturer guidance.