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904L Mi-FLEX 250mm x 1m CUT LENGTH (36Z-250-1)

Introducing the 904L Mi-FLEX 250mm x 1m Cut Length Flue Liner from National Flues: a premium, flexible, double-skinned stainless steel flue liner designed for relining masonry chimneys. Engineered to accommodate a range of fuel types including gas, oil, coal and more, this top-quality flue liner not only meets high industry standards with its HETAS and CE certifications but also delivers long-lasting performance reinforced by a lifetime warranty when installed with Screw-FIX accessories.

What it’s for

The 904L Mi-FLEX 250mm x 1m Cut Length Flue Liner is designed for relining within masonry chimneys, suitable for a variety of fuel types.

Full features & benefits

  • ✓
    - Made from high-grade 904L stainless steel, ensuring exceptional longevity and resistance to corrosion
  • ✓
    - Double-skinned design (inner smooth lining and convoluted outer skin) minimises heat loss and increases efficiency
  • ✓
    - Lifetime warranty offers long-term peace of mind, especially when paired with Screw-FIX accessories
  • ✓
    - Versatility in fuel compatibility means you can safely and efficiently use a variety of fuels
  • ✓
    - HETAS and CE certifications guarantee that you meet stringent safety and environmental standards
  • ✓
    - Detailed installation and maintenance instructions simplify the fitting process and ensure optimal performance over time
904L Mi-FLEX 250mm x 1m CUT LENGTH
IN STOCK
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Now only £223.99
including free delivery Give us a call if you find it cheaper and we'll normally price match.
  • Fast deliveryFriday, November 14th*
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At a Glance

  • Premium 904L stainless steel construction
  • Double-skinned flexible design for enhanced durability
  • Lifetime warranty when installed with Screw-FIX accessories
  • Multi-fuel compatibility: gas, oil, coal, coke, dry logs, dry peat, approved smokeless fuels
  • HETAS and CE approved for safety and quality standards
  • Comprehensive installation and maintenance guidelines

We Won't Be Beaten On Price

At National Flues, we continuously monitor competitor prices. This ensures that we consistently offer you the best deals on all our products. Here’s how we keep your costs low:

  • Daily Price Matching: Our team adjusts prices to ensure we stay competitive.
  • Bulk Purchasing Power: We sell a lot, so we can negotiate better rates with suppliers, passing the savings directly to you.
  • Operational Efficiency: We have streamlined processes to reduce overhead.

Price Match Guarantee: If you find the same product cheaper within 48 hours, we’ll match it and refund the difference.

Free Delivery Over £100: Orders over £100 are free delivery (call us if delivery is required outside the mainland UK).

“I saved 20% on my purchase compared to other retailers. Exceptional service!” – Jane D.

Have Questions?
Phone: 01670 206999
Email: sales@nationalflues.com

The 904L Mi-FLEX 250mm x 1m CUT LENGTH Flue Liner is the perfect choice for relining masonry chimneys, offering superior performance and durability. Crafted from high-quality 904L grade stainless steel, this double-skinned flexible flue liner boasts a smooth inner lining and a convoluted outer skin, both at 0.105mm thickness. The innovative quattrolock seal ensures robust construction, making it suitable for burning gas, oil, coal, coke, cured dry logs, cured dry peat, and approved smokeless fuels.

It is HETAS and CE approved for safety and peace of mind. Comprehensive installation and maintenance guidelines ensure ease of fitting and long-term reliability.

SKU: 36Z-250-1

Delivery Information* +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, November 14th. This is based on current lead times. Bear in mind that it is a busy time of year. If you need a product delivered by a specific time in the next 7 days, then please give us a call on 01670 206 999. Visit our Shipping Information page for more information.

About National Flues Ltd +

We began over 30 years ago as a fireplace shop in the North East. We now supply hundreds of trade professionals and thousands of retail customers, all across the UK, every month. We are still a family owned business, lead by the MD Neil, and always try our best to deliver the best possible experience. We also price match, so give us a call if you find this cheaper and want to buy from us. Visit our about us page to read a bit more.

This is us — real advice over the phone, or at the counter, and real stock in our warehouse.

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Trade counter Installer collection & same-day help.
Team helping customers at the counter
Advice Real people on the phone to spec the right parts.
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Here to help Friendly, straight answers from HETAS approved experts.
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Technical Specifications
SKU36Z-250-1
Dimensions250mm x 1m Cut Length
Inner Material904L Stainless Steel, 0.105mm thickness
Outer Material904L Stainless Steel, 0.105mm thickness
Seal TypeOmega-Lock
ApprovalsHETAS, CE
Fuel CompatibilityGas, Oil, Coal, Coke, Cured Dry Logs, Cured Dry Peat, Approved Smokeless Fuels
WarrantyLifetime (with Screw-FIX accessories)
ManufacturerMi-Flues Ltd
For optimal performance, install this flue liner from the top of the chimney, ensuring the directional arrows point upwards to promote proper gas flow. Always follow the comprehensive installation guidelines provided in the manual. It is crucial to use only approved accessories during installation, such as the recommended Screw-FIX fittings, to maintain safety standards and guarantee the lifetime warranty. Before commencing installation, check that all components are in good condition and comply with local building regulations.

This flue liner is compatible with gas, oil, coal, coke, cured dry logs, cured dry peat, and approved smokeless fuels.

Yes, the flue liner has comprehensive installation guidelines and should be fitted from the top of the chimney, ensuring the arrows point upward for proper gas flow.

The 904L Mi-FLEX Flue Liner is HETAS and CE approved, ensuring it meets high safety and quality standards.

Yes, National Flues offers reliable nationwide delivery for both retail and trade customers.

It is recommended to sweep chimneys serving solid fuel appliances at least once a year or more frequently as necessary.

Both the inner and outer linings of the 904L Mi-FLEX Flue Liner are 0.105mm thick.

The 904L Mi-FLEX Flue Liner comes with a lifetime manufacturer's warranty when installed with Screw-FIX accessories.

 

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