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904L Mi-FLEX 80mm x 44m COIL (36Z-80-44)
National Flues proudly presents the premium 904L Mi-FLEX 80mm x 44m COIL – a flexible flue liner engineered from superior 904L stainless steel. This top-of-the-line product, synonymous with high quality and dependable performance, is an ideal choice for relining masonry chimneys. Offering versatile, multi-fuel compatibility and backed by a lifetime warranty with Screw-FIX accessories, the 904L Mi-FLEX is the ultimate solution for achieving an efficient, safe chimney system. Experience exceptional durability and compliant standards with this expertly crafted chimney liner, exclusively available at National Flues.
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In Stock
£1,419.49
with free delivery
Give us a call if you find it cheaper and we'll try to price match.
Innovative Omega-Lock seam ensures a secure, quattrolock installation
Certified by HETAS and CE for your peace of mind
Versatile multi-fuel performance for gas, oil, coal, smokeless fuels and more
Lifetime manufacturer’s warranty when installed with Screw-FIX accessories
Easy top-down installation design for efficiency
Low maintenance with only annual sweeping required for optimal performance
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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.
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 44m COIL is a versatile and durable multi-fuel flexible flue liner, perfect for relining masonry chimneys. Constructed with high-grade 904L stainless steel, both the inner and outer layers of this flue liner are 0.105mm thick, ensuring high resistance to corrosion and durability under various fuel conditions. This liner is accredited by HETAS and CE approved, guaranteeing high standards of safety and performance.Installation is straightforward but must be done from the top of the chimney; please ensure the arrows indicating gas flow are pointing upwards.
Maintenance involves an annual sweeping, especially for chimneys serving solid fuel appliances. The unique quattrolock seal formed by folding the liner strip in four planes ensures a secure and reliable installation.
Multi-fuel (gas, oil, coal, coke, smokeless fuels, and more)
The 904L Mi-FLEX flue liner must be installed from the top of the chimney with the gas flow arrows pointing upwards to ensure proper function. Use the recommended Screw-FIX accessories for a secure and reliable attachment. Follow the manufacturer’s instructions closely to guarantee safety and durability. For chimneys servicing solid fuel appliances, it is essential to organise an annual sweep to maintain optimal performance. Regularly inspect the quattrolock seal to ensure it remains intact and effective throughout its lifespan.
This flue liner is suitable for burning gas, oil, coal, coke, cured dry logs, cured dry peat, and approved smokeless fuels.
Yes, it is approved and listed by HETAS and is also CE approved.
The flue liner should always be installed from the top of the chimney, with the arrows pointing upwards to ensure proper gas flow.
This coil measures 80mm in diameter and is 44 meters long.
Yes, it comes with a lifetime manufacturer’s warranty when installed with Screw-FIX accessories.
For solid fuel appliances, it is recommended to sweep and maintain chimneys at least once a year.
You can, as long as the pot is in good condition. If not using a suspended cowl, you may need to remove the pot from the stack.
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 44m COIL buyers guide
Introduction
The 904L Mi-FLEX 80mm x 44m COIL is a high-calibre, flexible flue liner specifically designed for relining masonry chimneys. Manufactured by Mi-Flues Ltd using superior 904L stainless steel, this product represents the pinnacle of safety, durability, and versatility in chimney flue systems. Whether you are a homeowner aiming to improve your domestic heating setup or a professional installer seeking reliable materials, this product is engineered to exceed your expectations.
Key Features & Benefits
Outstanding Material Quality:
- Crafted from 904L stainless steel, both the inner and outer layers boast a 0.105mm thickness. This ensures remarkable resistance to corrosion, even when subjected to harsh conditions. The use of premium materials translates directly into a significantly extended service life.
Innovative Omega-Lock Seam:
- The Omega-Lock seam creates a unique quattrolock seal that provides a robust connection between the liner components. This advanced design not only enhances safety but also guarantees that the installation remains secure over time.
Safety & Certification:
- With approvals from HETAS and Certificates from CE, the 904L Mi-FLEX meets and exceeds the rigorous standards required for modern flue installations. This means you can install it with confidence, knowing that it complies with the highest safety protocols.
Versatility in Fuel Compatibility:
- This liner is optimised for a wide range of fuels including gas, oil, coal, coke, and smokeless fuels. Such versatility ensures that no matter what type of heating system you operate, the 904L Mi-FLEX will deliver consistent, efficient performance.
Lifetime Warranty Advantage:
- When installed with Screw-FIX accessories, the product is backed by a lifetime warranty. This lifetime guarantee is an indication of the manufacturer’s confidence in the product’s performance and durability, providing homeowners and professionals with peace of mind for many years.
Technical Specifications & Details
For those interested in the technical aspects, the 904L Mi-FLEX features an 80mm diameter coil that stretches out to 44m in length. The precise engineering of its 904L stainless steel construction, coupled with the innovative Omega-Lock seam, ensures that every installation is performed to the highest standard. This technical excellence not only guarantees efficient performance but also ensures the longevity of the flue liner under a variety of operational scenarios.
Installation & Maintenance
The installation process has been carefully designed to be both straightforward and effective. It is imperative that the liner be inserted from the top of the chimney. Ensure that the arrows marking the gas flow are correctly positioned to point upwards. It is also essential to utilise the recommended Screw-FIX accessories during installation to secure a steadfast connection. For those utilising the flue for solid fuel applications, it is recommended that the chimney be swept and inspected on an annual basis. This regular maintenance helps prevent buildup and ensures that the flue liner operates at peak efficiency. During routine inspections, pay special attention to the integrity of the Omega-Lock quattrolock seal, as this is key to the product's long-term performance.
Addressing Common Questions
Many customers have queries regarding the application and benefits of the 904L Mi-FLEX. One common question is related to the types of fuels it can support. The answer is simple: this liner is designed to handle a wide array of fuels including gas, oil, coal, coke, and approved smokeless fuels, making it a versatile choice for different heating systems.
Another frequent inquiry concerns the installation process itself. Rest assured, the top-down installation method, combined with visual indicators such as the gas flow arrows, makes the installation process both intuitive and reliable. Following the guidelines ensures a secure and long-lasting setup that meets all relevant safety standards.
Why Choose the 904L Mi-FLEX?
Choosing the correct flue liner is a critical decision for ensuring the longevity and efficiency of your chimney. The 904L Mi-FLEX offers unmatched durability due to its premium 904L stainless steel composition, and its lifetime warranty (when installed with the right accessories) provides significant value over time. This product is a testament to superior engineering and reliability. It is meticulously designed to serve a wide range of fuel types, ensuring that your heating system will run smoothly no matter what kind of fuel you choose to burn. Additionally, with nationally recognised certifications such as HETAS and CE, you are assured of meeting statutory safety and performance standards with every installation.
Conclusion
In summary, the 904L Mi-FLEX 80mm x 44m COIL is a robust, high-performance flexible flue liner that marries quality materials with advanced engineering. Its versatility, ease of installation, and extensive warranty make it an ideal choice for both residential and commercial applications. Whether you are looking to upgrade an existing chimney or installing a new flue system, this product delivers reliability and efficiency that is hard to match. Designed to meet the needs of demanding environments, it offers a secure, long-lasting solution for ensuring optimal performance of your flue system.
Buy now or call 01670 206 999.
Seize the reliability of premium 904L Mi-FLEX now – safe, durable, and built to last!
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