We use cookies to ensure a smooth, secure, and ever-improving experience on our website. By continuing to browse, you agree to our use of cookies as detailed in our Cookie Policy. Enjoy your visit and let us now if you need any help!
Cookie Preferences
We use different types of cookies for various purposes. Please select which you allow:
904L Mi-FLEX 80mm x 1m CUT LENGTH (36Z-80-1)
Discover National Flues' high-quality 904L Mi-FLEX 80mm x 1m CUT LENGTH, a state-of-the-art flexible flue liner designed to reline masonry chimneys. Made from premium 904L stainless steel, this double-skinned, multi-fuel compatible flue liner is both HETAS approved and CE certified, ensuring optimum safety and performance for a variety of fuels. Perfect for both modern and traditional chimney installations, our product stands as the ideal choice for customers seeking robustness and efficiency.
Hover to Zoom / Click for Gallery
In Stock
£32.49
Give us a call if you find it cheaper and we'll try to price match.
At a Glance
Premium 904L stainless steel construction with double-skinned design
Smooth inner and convoluted outer layer, each 0.105mm thick
Quattrolock seam for enhanced durability and secure bonding
Suitable for multiple fuels including gas, oil, coal, coke, cured dry logs, cured dry peat, and approved smokeless
HETAS approved and CE certified for industry-leading safety standards
Lifetime manufacturer warranty when installed with Screw-Fix accessories
×
Email Product
Enter your email address to send the product details:
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.
The 904L Mi-FLEX 80mm x 1m CUT LENGTH is an industry-leading double-skinned flexible flue liner, engineered to reline masonry chimneys. Crafted from premium 904L grade stainless steel, it features both a smooth inner and convoluted outer skin, each with a thickness of 0.105mm. This advanced construction includes a quattrolock seam, ensuring the highest level of strength and durability.
Approved by HETAS and CE certified, this flue liner is suitable for a variety of fuels including gas, oil, coal, coke, cured dry logs, cured dry peat, and approved smokeless fuels. Installation is straightforward: simply start from the top of the chimney with the arrows pointing upwards to ensure correct gas flow. Maintenance is minimal but essential, with an annual sweep recommended for chimneys serving solid fuel appliances.
SKU: 36Z-80-1
Technical Specifications
SKU
36Z-80-1
Material
904L Stainless Steel (Inner & Outer 0.105mm)
Design
Double-skinned with smooth inner and convoluted outer surfaces
Top-down installation with proper arrow alignment for optimal gas flow
- Begin installation at the top of the chimney with the arrows pointing upward to ensure correct gas flow.
- Use a piece of string attached to the nose cone to guide the liner down carefully.
- Verify that the chimney pot is in good condition; if using a suspended cowl with a deteriorated pot, removal may be necessary before installation.
- It is recommended to schedule an annual sweep for chimneys serving solid fuel appliances to maintain peak performance and safety.
The 904L Mi-FLEX flue liner is suitable for burning gas, oil, coal, coke, cured dry logs, cured dry peat, and approved smokeless fuels.
The flue liner should be installed from the top of the chimney with the arrows pointing upwards to ensure proper gas flow. Use a piece of string attached to the Nose Cone to pull the liner down the chimney.
Yes, the 904L Mi-FLEX flue liner is both HETAS and CE approved.
The flue liner features both a smooth inner and convoluted outer skin, each with a thickness of 0.105mm.
It is recommended that chimneys serving solid fuel appliances be swept and maintained at least once a year.
If you are not using a suspended cowl and your chimney pot is in poor condition, it should be removed before installing the flue liner.
The flue liner is constructed from 904L grade stainless steel using a single strip of steel that is bent at 180 degrees and then the seam is folded in four planes to create a quattrolock seal.
Delivery Information +
We work relentlessly to ensure you get your order fast.
Estimated delivery for this product is Tuesday, April 29th.
If you need faster stove or fireplace delivery please give us a call.
We can often reduce longer lead times if we pay the carrier £25 for express delivery.
Visit our Shipping Information page for more information.
Warranty & Returns +
All our products come with warranties. Mi-Flex offers a lifetime guarantee.
Returns for damaged items are covered by insurance; non-damaged returns incur return delivery costs.
Price Match Guarantee +
We will match any price like for like on a retail basis. Give us a call if you find it cheaper and want to buy from us.
Read our review in our 904L Mi-FLEX 80mm x 1m CUT LENGTH buyers guide
Comprehensive Buyers Guide for the 904L Mi-FLEX 80mm x 1m CUT LENGTH
When considering a new flue liner for your chimney, it is important to understand not only the key features of the product but also how it integrates into your home heating system. In this guide, we detail everything you need to know about the 904L Mi-FLEX 80mm x 1m CUT LENGTH, from its unique engineering features to the process of installation and ongoing maintenance.
Product Overview
The 904L Mi-FLEX CUT LENGTH is crafted from high-grade 904L stainless steel and is engineered specifically for relining masonry chimneys. This flue liner boasts a dual-layer design – a smooth inner surface for efficient gas flow and a convoluted outer layer to provide extra insulation and durability. The advanced Quattrolock seam ensures that once installed, the liner remains robust and secure under varying operating conditions. As an industry-leading product, it is HETAS approved and CE certified, ensuring it meets the highest safety standards required in the UK.
Key Features & Benefits
- Premium Material: Constructed from 904L stainless steel, the liner resists corrosion and withstands high temperatures, offering exceptional longevity and minimal maintenance.
- Double-Skinned Design: The dual layers work together to enhance insulation, ensuring that heat is managed effectively, which is particularly beneficial in colder climates.
- Innovative Seaming: The Quattrolock seam is designed to provide a watertight and secure connection, significantly reducing potential risks associated with loose or improperly sealed liners.
- Versatility: Engineered to support a wide range of fuels including gas, oil, coal, coke, as well as cured dry logs, cured dry peat, and approved smokeless fuels, the 904L Mi-FLEX is an adaptable choice for many households.
- Regulatory Approvals: With HETAS and CE certifications, you can be confident in the product's performance and compliance with stringent safety and quality standards.
Understanding the Installation Process
Installing a flue liner might seem challenging, but the 904L Mi-FLEX has been designed with ease of installation in mind. The installation process is straightforward: begin at the top of your chimney, ensuring that the built-in arrows are aligned upwards to facilitate correct gas flow. A simple piece of string attached to the nose cone helps you guide the liner down steadily. It is essential to confirm that the chimney pot is in good condition; any signs of deterioration may require it to be removed before installation. Moreover, for those who rely on solid fuel appliances, an annual chimney sweep is recommended.
Addressing Common Concerns
Durability: One of the most frequent questions is about the longevity of a flue liner. With its high-grade stainless steel construction and innovative double-skinned design, the 904L Mi-FLEX is built to last. The lifetime warranty (when paired with Screw-Fix accessories) underscores the manufacturer’s confidence in the product's durability.
Safety: The use of only premium materials and rigorous certification processes (HETAS and CE) ensure the liner not only meets but exceeds contemporary safety standards. Homeowners can rest assured that their chimney is secure and that heat is being managed effectively.
Installation Ease: While there is a common concern regarding the complexities involved in installation, the design of the 904L Mi-FLEX facilitates a user-friendly, top-down installation method which minimizes labour-intensive processes. Clear guidance is provided in the installation instructions to help both professionals and experienced DIY enthusiasts.
The Importance of Optional Accessories
To further enhance your installation, it is advisable to explore additional optional accessories such as the Screw-Fix system. These accessories are specifically designed to work with the 904L Mi-FLEX, ensuring a tighter, more secure installation which offers better overall performance. By integrating these complementary products, you can reduce the risk of installation errors and guarantee maximum safety and longevity of your flue liner.
Why Choose the 904L Mi-FLEX?
Investing in the 904L Mi-FLEX 80mm x 1m CUT LENGTH means choosing quality, safety, and efficiency. The product is not only built to endure, thanks to its robust materials and superior design, but it also offers peace of mind through its comprehensive safety certifications and lifetime warranty (when installed with the recommended accessories). Whether replacing an old chimney liner or reconditioning your system, this product offers a seamless, high-performance solution that can be trusted for years to come.
Final Thoughts
The 904L Mi-FLEX is the ultimate flue liner solution for those who do not wish to compromise on quality or safety. With its advanced engineering features, simple installation process, and the availability of premium optional accessories to further secure your chimney system, it stands out as a leader among chimney re-lining products. For homeowners and heating professionals alike, this is a smart investment in both the integrity and efficiency of your home heating system.
Elevate your chimney’s performance and safeguard your home heating system with superior quality that lasts. Add to cart or call 01670 206 999.
Secure outstanding performance and lasting safety—add the 904L Mi-FLEX to your installation today or call us now.
×
Select Product Options
×
Product added
Would you like to keep shopping or head to checkout?
