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904L Mi-FLEX 150mm x 40m COIL (36Z-150-40)
Discover the premier 904L Mi-FLEX 150mm x 40m COIL flue liner from National Flues, engineered to deliver industry-leading performance in multi-fuel applications. This high-grade, double-skinned flue liner is ideal for masonry chimneys and is backed by a lifetime warranty when installed with Screw-FIX accessories. Enhance your home’s efficiency with a product that perfectly meets UK safety standards and delivers reliable, long-term durability.
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In Stock
£1,426.99
with free delivery
Give us a call if you find it cheaper and we'll try to price match.
At a Glance
Manufactured from 904L grade stainless steel for exceptional durability
Double-skinned design with 0.105mm thick inner and outer layers
Multi-fuel capability including gas, oil, coal, coke, cured dry logs, cured dry peat, and approved smokeless fuels
CE approved and HETAS listed for industry-standard safety and performance
Lifetime warranty when installed with Screw-FIX accessories
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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.
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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 150mm x 40m COIL is a versatile and durable flue liner designed to fit masonry chimneys. Manufactured with high-grade 904L stainless steel, this double-skinned flexible liner is built to last. It boasts a smooth inner liner and a convoluted outer skin, each 0.105mm thick for enhanced durability.
Featuring a unique quattrolock seal, the liner is resistant to corrosion and is CE approved and HETAS listed. Perfect for burning gas, oil, coal, coke, cured dry logs, cured dry peat, and approved smokeless fuels, this flue liner ensures optimal performance and safety. The product comes with a lifetime warranty when installed with Screw-FIX accessories.
SKU: 36Z-150-40
Technical Specifications
SKU
36Z-150-40
Dimensions
150mm diameter x 40m coil
Material
904L stainless steel (inner and outer layers at 0.105mm thickness)
Lifetime (when installed with Screw-FIX accessories)
For best results, the 904L Mi-FLEX liner should be installed from the top of the chimney. Begin by verifying the liner’s compatibility with your chimney by pulling a small section down before a full installation. Secure a string to the Nose Cone (sold separately) ensuring the arrow indicators point upward to maintain the correct gas flow. As you feed the liner into the chimney, have an assistant guide it from above. Once the liner is fully positioned, remove the Nose Cone and proceed with final fixing using the recommended Screw-FIX accessories. Always refer to the manufacturer's installation manual for detailed guidance and safety warnings.
904L grade stainless steel is highly resistant to corrosion and extreme temperatures, making it ideal for multi-fuel applications. It ensures longevity and performance in demanding conditions.
Yes, this flue liner is suitable for burning gas, oil, coal, coke, cured dry logs, cured dry peat, and approved smokeless fuels.
To ensure a proper fit, pull a small section of the liner down your chimney before installation. This checks the compatibility of the liner's diameter with your chimney.
The flue liner should always be installed from the top of the chimney. Secure a string to the Nose Cone (sold separately), ensuring the arrows point upwards for correct gas flow. Pull the liner down the chimney using the string, with someone feeding it from the top. Finally, remove the Nose Cone once the liner is in place.
It is recommended to sweep and maintain chimneys serving solid fuel appliances at least once a year or as frequently as necessary to ensure safety and performance.
Yes, the 904L Mi-FLEX flue liner is CE approved and listed by HETAS, ensuring it meets high safety and performance standards.
The flue liner comes with a lifetime manufacturer’s warranty when installed with Screw-FIX accessories, covering the lifespan of the appliance it is connected to.
Delivery Information +
We work relentlessly to ensure you get your order fast.
Estimated delivery for this product is Wednesday, April 30th.
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 150mm x 40m COIL buyers guide
Introduction
The 904L Mi-FLEX 150mm x 40m COIL flue liner is a cutting-edge solution designed to relining masonry chimneys with exceptional durability and flexibility. Manufactured using premium 904L grade stainless steel, this liner not only withstands extreme conditions but also optimises performance for a diverse range of fuel types. In this comprehensive buyer's guide, we will explore the technical aspects, installation process, maintenance tips, and key advantages of this superior product to help you make an informed decision.
Product Overview
The 904L Mi-FLEX COIL is engineered for those who do not want to compromise on quality. Constructed with dual layers of 904L stainless steel, each meticulously crafted to a uniform 0.105mm thickness, this liner offers robust resistance against corrosion, high temperatures, and physical wear. Ideal for burning gas, oil, coal, coke, cured dry logs, cured dry peat, and approved smokeless fuels, it guarantees a versatile solution for various heating setups.
Key Benefits
- Durability: The use of top-grade 904L stainless steel ensures that your chimney lining remains effective and secure even in the most demanding conditions.
- Multi-fuel Flexibility: Whether you are switching between different fuel types or require a solution that supports various systems, the 904L Mi-FLEX is built to accommodate your needs.
- Industry Approvals: With both CE approval and HETAS listing, you are assured of a product that adheres to strict UK standards for safety and performance.
- Lifetime Warranty: Provided (when installed with the recommended Screw-FIX accessories), the lifetime warranty acts as a testament to the product’s long-lasting reliability and quality.
Technical Insights
For those with a technical inclination, the 904L Mi-FLEX COIL does not disappoint. Its double-skinned design consists of a smooth inner liner that facilitates optimal gas flow, paired with a convoluted outer skin for added strength. This design not only increases the liner's resistance to damage but also ensures that it is capable of handling a variety of fuel combustion processes effectively. Moreover, the Omega-Lock seam adds an extra layer of security by maintaining the integrity of the liner under pressure and during temperature fluctuations.
Detailed Specifications
- Material: High-grade 904L stainless steel, both inner and outer layers at 0.105mm
- Dimensions: 150mm diameter and a 40m coil length
- Fuel Compatibility: Suitable for multiple fuel types
- Certifications: CE approved and HETAS listed
- Warranty: Lifetime when installed with Screw-FIX accessories
Installation and Maintenance
The installation of the 904L Mi-FLEX liner is straightforward with the right guidance and accessories. It is crucial to start installation from the top of the chimney. First, check the compatibility by pulling a short section of the liner down into the chimney. Secure the liner using a string attached to a Nose Cone (which must be purchased separately) ensuring the arrow on the Nose Cone points upwards to maintain correct flow direction. As the liner is fed into the chimney, an assistant should help guide it from above to avoid any kinks or misalignment.
Once properly installed, regular maintenance is recommended to ensure optimal performance. It is advisable to have your chimney swept at least once a year, or more frequently if using solid fuels. Constant vigilance and upkeep will help in maintaining the long-life and efficiency of both the flue liner and your overall heating system.
Why Choose the 904L Mi-FLEX?
Choosing the right flue liner is paramount in ensuring the safety, efficiency, and longevity of your chimney system. The 904L Mi-FLEX stands out due to its robust construction, multi-fuel compatibility, and excellent safety certifications. The dual-layer 904L stainless steel design ensures that the liner can handle harsh weather and high-temperature conditions without deteriorating. Its CE approval and HETAS listing speak volumes about its reliability and adherence to stringent UK standards. Furthermore, the lifetime warranty, available when installed with Screw-FIX accessories, adds unmatched value and assures you that you are investing in a product that is built to last.
Addressing Common Concerns
Many customers wonder about the ease of installation and whether the product will fit their existing chimney structures. The installation process is designed to be intuitive provided you follow the guidelines carefully. For added assurance, a trial pull of a small section into your chimney is recommended prior to full installation. Should any questions or challenges arise, our expert customer support is ready to assist you at every step.
Another frequently addressed concern is maintenance. With the proper cleaning and periodic inspections, the 904L Mi-FLEX ensures continuous performance without risk of contamination or structural compromise. The design also minimises the build-up of soot and creosote, which are commonly associated with flue liners.
Optional Accessories
Enhance your installation and ensure the longevity of your flue liner with optional accessories. Investing in items such as the Screw-FIX accessory system and a custom Nose Cone further enhances the performance and safety of the installation. These accessories are specifically designed to complement the 904L Mi-FLEX and ensure that every component of your chimney system operates in unison for maximum efficiency.
Conclusion
In summary, the 904L Mi-FLEX 150mm x 40m COIL flue liner is the ideal choice for those seeking a premium, reliable, and versatile chimney lining solution. With its superior construction, comprehensive industry approvals, and lifetime warranty (when used with Screw-FIX accessories), this product offers outstanding value and performance. Whether you are renovating your home or upgrading an existing system, the 904L Mi-FLEX is engineered to meet your high standards in safety, efficiency, and durability. Invest in quality that lasts and enjoy a worry-free chimney operation for years to come. Buy now or call 01670 206 999.
Secure your top-quality, lifetime-warrantied flue liner today!
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