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904L Mi-FLEX 100mm x 44m COIL (36Z-100-44)
Experience excellence with the 904L Mi-FLEX 100mm x 44m COIL from National Flues, the premium multi fuel flue liner designed for relining masonry chimneys. Crafted in 904L stainless steel, this flexible flue liner is engineered to deliver superior performance and safety. Whether using gas, oil, or solid fuels, this high-quality, HETAS approved and CE certified flue liner is the ultimate solution for ensuring efficient heating systems. Trust National Flues for reliable chimney components and industry-leading service.
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In Stock
£1,877.49
with free delivery
Give us a call if you find it cheaper and we'll try to price match.
At a Glance
Constructed from high-grade 904L stainless steel for lasting durability
Double-skinned design with a smooth inner surface and convoluted outer layer for optimal gas flow
Manufactured using a single strip with a robust Omega-Lock seam
HETAS approved and CE certified to ensure safety and compliance
Lifetime warranty when installed with Screw-FIX accessories
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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 100mm x 44m COIL is a double-skinned flexible flue liner specifically designed for relining masonry chimneys. Crafted from high-grade 904L stainless steel, this liner boasts a smooth inner surface and a convoluted outer skin, each with a thickness of 0.105mm. The unique construction, featuring a single strip of steel bent at 180 degrees and closely sealed with a quattrolock seam, ensures maximum durability and safety.
Approved by HETAS and CE certified, this flue liner is ideal for use with gas, oil, coal, coke, cured dry logs, peat, and smokeless fuels. Installation is a breeze: simply feed the liner down your chimney from the top, ensuring the arrows indicate the direction of gas flow. Regular maintenance is essential, with an annual sweep recommended for chimneys servicing solid fuel appliances to maintain optimal performance.
SKU: 36Z-100-44
Technical Specifications
SKU
36Z-100-44
Dimensions
100mm x 44m coil (44m drum)
Material
904L stainless steel, 0.105mm thick (inner and outer)
Feed from the top of the chimney according to arrow markings
Warranty
Lifetime (when installed with Screw-FIX accessories)
Installation is straightforward: start at the top of your masonry chimney and feed the liner down, ensuring the arrows on the liner indicate the correct direction for gas flow. It is recommended to have an assistant at the top of the chimney to guide and secure the liner using a strong, long string. For best results and to validate the lifetime warranty, always use the recommended Screw-FIX accessories. Additionally, note that chimneys servicing solid fuel appliances require an annual sweep to maintain optimal performance and reduce the risk of blockages.
The 904L Mi-FLEX is suitable for use with gas, oil, coal, coke, cured dry logs, cured dry peat, and approved smokeless fuels.
Installation involves feeding the liner down your chimney from the top, ensuring the arrows point upwards for proper gas flow. It's advisable to have someone assist from the top of the chimney while pulling the liner down using a secured string.
Yes, the 904L Mi-FLEX flue liner is approved by HETAS and is CE certified, ensuring it meets high safety standards.
Chimneys serving solid fuel appliances should be swept at least once a year. Regular maintenance helps ensure optimal performance and longevity.
Yes, the 904L Mi-FLEX is suitable for a gas boiler, along with other compatible fuels listed.
904L stainless steel provides excellent resistance to corrosion and high temperatures, making it ideal for demanding environments like flue systems.
While basic tools will suffice, it's recommended to use a Nose Cone and a strong, long piece of string for guiding the liner into place efficiently.
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 100mm x 44m COIL buyers guide
Introduction
The 904L Mi-FLEX 100mm x 44m COIL is engineered to meet the demanding requirements of modern chimney relining. Designed by Mi-Flues Ltd and supplied by National Flues, this premium multi fuel flue liner is crafted from high-grade 904L stainless steel, ensuring ultimate durability, corrosion resistance, and reliability throughout its lifespan. Whether you are a professional installer or a homeowner undertaking a chimney upgrade, this product is the clear choice for securing a safe and efficient home heating solution.
Key Features and Their Benefits
Superior Material Quality: The use of 904L stainless steel, with both the inner and outer layers set at 0.105mm, means that the liner can withstand high temperatures and corrosive environments encountered in chimney systems. This significantly reduces the need for frequent replacements and minimises upkeep costs.
Dual-Layered Construction: The double-skinned design features a smooth inner surface that optimises gas flow, while the outer convoluted skin adds an extra layer of protection. This thoughtful combination not only maximises efficiency but also enhances the liner’s overall lifespan.
Robust Seaming: The innovative Omega-Lock seam, achieved by bending a single strip of steel at 180 degrees, provides a secure and seamless join. This construction method ensures that the liner will remain leak-free, thereby enhancing the safety of your chimney system.
Certifications and Warranty: HETAS approval and CE certification offer independent assurance of the product’s safety and quality. Additionally, the lifetime warranty (when installed using Screw-FIX accessories) is a testament to the confidence National Flues has in this flue liner, giving you long-term peace of mind.
Installation Process
Installing the 904L Mi-FLEX 100mm x 44m COIL is designed to be as hassle-free as possible. Begin installation at the top of your masonry chimney by feeding the liner downwards. Keep a close watch on the arrow indicators which confirm the correct gas flow direction. We recommend having an assistant at the top to help guide the liner into place by using a robust, long string. Once positioned correctly, check that the liner is securely in place and ensure that the recommended Screw-FIX accessories are used to maintain your warranty and secure the installation. For chimneys serving solid fuel appliances, it is crucial to schedule an annual sweep to ensure optimal performance and to prevent potential blockages.
Maintenance and Safety
The longevity and effectiveness of your flue liner largely depend on regular maintenance. Annual chimney sweeps are essential if you are using solid fuels, as this removes soot and debris that can build up over time. Routine inspections can also help detect any early signs of wear, particularly around the welded seams, ensuring that the system continues to operate safely and efficiently. By investing in high-quality materials and maintaining a rigorous upkeep schedule, you ensure that your home heating system remains both safe and economical over the years.
Addressing Common Objections
Cost Concerns: While the upfront investment in a premium flue liner like the 904L Mi-FLEX might seem higher compared to lower-grade alternatives, its durability and reliability result in significantly lower maintenance and replacement costs over its lifetime. This means you truly save money in the long run.
Installation Worries: Understanding that chimney relining might seem complex, the 904L Mi-FLEX has been engineered for ease of installation. The clear directional indicators and compatibility with standard installation tools make the process straightforward, even for those with minimal experience. Additionally, comprehensive support and guidance are available from National Flues, ensuring you feel confident every step of the way.
Fuel Flexibility: Some homeowners may be concerned about whether a single flue liner is compatible with various fuel types. The 904L Mi-FLEX has been rigorously tested to perform with a range of fuels including gas, oil, coal, coke, cured dry logs, peat, and approved smokeless fuels. This versatility means you can trust this product regardless of the type of fuel your appliance uses.
Why Choose National Flues?
At National Flues, quality and customer satisfaction are paramount. With years of industry experience, we pride ourselves in offering products that not only meet but exceed safety and performance standards. Our competitive pricing, combined with reliable delivery and a secure online shopping experience, ensures that every customer enjoys peace of mind. Moreover, our expert team is always on hand to advise on product specifications, installation techniques, and maintenance tips, so you always have the support needed to optimise your chimney system. We are dedicated to helping both trade professionals and homeowners maximise the durability and performance of their heating solutions.
Final Thoughts
Choosing the right flue liner is an investment in the safety and efficiency of your home’s heating system. The 904L Mi-FLEX 100mm x 44m COIL is a product that embodies quality, innovation, and reliability. With its high-grade stainless steel construction, robust double-layer design, and industry-leading seaming technology, it is the ideal solution for relining your masonry chimney. National Flues stands behind this product with unmatched warranties and customer support, ensuring you are never left in the dark when it comes to your heating needs.
Add this product to your cart now or call 01670 206 999.
Invest in the 904L Mi-FLEX today for unmatched quality and long-term performance.
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