Premium 3″ Chimney Flexible Flue liner / Flexible Flue Liner 904L

This 904L Grade Flexible Flue Liner is a premium-quality twin-wall chimney liner designed for relining existing masonry chimneys. Manufactured from high-performance 904L stainless steel on both the inner and outer walls, it offers exceptional resistance to corrosion, making it ideal for demanding applications and multi-fuel installations. The 904L grade provides superior durability compared to standard 316L liners, particularly when used with smokeless fuels, coal, and other corrosive fuel types. Featuring a smooth inner liner and corrugated outer wall, this flexible flue liner promotes efficient flue gas flow while maintaining the flexibility required to navigate bends and offsets within existing chimney systems. Designed for long-term reliability, it is suitable for wood-burning stoves, multi-fuel appliances, gas fires, and oil-fired heating systems. Manufactured to recognised industry standards and approved for multi-fuel applications, this liner provides a safe, durable, and professional chimney relining solution.

Key Features

• Premium 904L Stainless Steel Construction – Manufactured from high-grade 904L stainless steel on both the inner and outer walls, offering exceptional resistance to corrosion, acidic condensates, and harsh flue conditions for maximum longevity.
• Superior Corrosion Resistance – The enhanced alloy composition of 904L stainless steel provides greater protection against pitting, crevice corrosion, and chemical attack, making it ideal for multi-fuel and smokeless fuel applications.
• Twin-Wall Flexible Construction – The double-skin design combines strength and flexibility, allowing the liner to be installed through existing chimney systems while maintaining structural integrity.
• Smooth Inner Wall Design – The smooth internal surface improves flue gas flow, helping to reduce soot deposits and support efficient appliance performance.
• Omega-Lock Seam Technology – Manufactured using a precision-engineered Omega-Lock seam that creates a strong, gas-tight and durable connection throughout the length of the liner.
• HETAS Approved – Tested and approved to recognised industry standards, ensuring safety, quality, and compliance for chimney relining applications.
• Long-Life Performance – Designed for demanding installations where maximum durability is required, offering an extended service life when installed and maintained correctly.

Specification

• Inner Wall: Thickness 0.105mm
• Outer Wall: Thickness 0.105mm
• Seam Type: Omega-Lock / Quattrolock
• Fuels: Smokeless
• Approvals: HETAS Approved, CE Certified
• Designation: BS EN 1856-2 T600 N1 W Vm L70011 G
• Designation 2:BS EN 1856-2 T200 P2 W Vm L70011 O