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316L Mi-FLEX 125mm x 44m COIL (35Z-125-44)
Enhance your chimney’s performance with the National Flues 316L Mi-FLEX 125mm x 44m COIL. This flexible, high-quality flue liner is expertly crafted from 316L stainless steel, making it ideal for multi-fuel systems. Whether you’re dealing with gas, oil, coal, or a combination of fuels, this liner ensures efficient and reliable operation. Complement your installation with our optional accessories for the perfect fit and secure setup.
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In Stock
£622.49
with free delivery
Give us a call if you find it cheaper and we'll try to price match.
At a Glance
Made from 316L grade stainless steel for superior durability
Double-skinned design with a smooth inner liner and convoluted outer for extra protection
Manufactured as a single strip with a reliable Omega-Lock seam
Suitable for multi-fuel applications including gas, oil, coal, coke, and cured dry fuels
HETAS approved and CE certified for safety and reliability
Lifetime manufacturer’s warranty when installed with Screw-FIX accessories
125mm diameter with a 44m drum for extensive chimney relining
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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 316L Mi-FLEX 125mm x 44m COIL is a double-skinned flexible flue liner, expertly designed to reline masonry chimneys. Constructed with a smooth inner liner from 316L grade stainless steel, this flue liner offers robust durability at 0.105mm thickness. Its convoluted outer skin, also made of 316L stainless steel, ensures maximum protection.
Notably, the liner is created from a single strip of steel bent at 180 degrees, sealed with an Omega-Lock for a secure fit. Approved by HETAS and CE-certified, this versatile flue liner is suitable for gas, oil, coal, coke, cured dry logs, and cured dry peat. Installation is straightforward; however, ensure the liner fits the chimney, sweep the chimney, and ensure the pot is in good condition.
Maintenance is simple—sweep the chimneys serving solid fuel appliances at least once a year to maintain optimal performance.
• Before installation, confirm the liner’s compatibility with your chimney dimensions by testing a small section for fit
• Sweep the chimney thoroughly and check that the pot is in good condition to avoid installation issues
• Follow the detailed installation guidelines provided in the manual, or consider professional assistance for optimal results
• For enhanced security, use optional Screw-FIX accessories to ensure the liner remains firmly in place
• Regular maintenance, including an annual sweep for chimneys serving solid fuel appliances, is recommended to sustain peak performance
The 316L Mi-FLEX liner is suitable for burning gas, oil, coal, coke, cured dry logs, and cured dry peat.
Ensure the liner will fit by pulling a small section of the diameter liner down the chimney before full installation.
The flue liner has a thickness of 0.105mm, made from durable 316L grade stainless steel.
Yes, the 316L Mi-FLEX flue liner is approved and listed by HETAS and is also CE certified.
Yes, you can install it yourself by following the provided checklist. However, professional installation is recommended for optimal results.
It's recommended to sweep and maintain chimneys serving solid fuel appliances at least once a year.
Yes, when installed with Screw-FIX accessories, this flue liner carries a lifetime manufacturer's warranty.
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 316L Mi-FLEX 125mm x 44m COIL buyers guide
Comprehensive Buyer’s Guide for the 316L Mi-FLEX 125mm x 44m COIL
Welcome to the ultimate guide for the 316L Mi-FLEX 125mm x 44m COIL, a premium flexible flue liner offered by National Flues. This guide is designed to provide you with all the information you need to understand the product, its features, benefits, and why it is the ideal choice for relining your masonry chimney. Whether you are a homeowner or a professional installer, this guide will help you make an informed decision.
Product Overview
The 316L Mi-FLEX liner is constructed from high-grade 316L stainless steel, ensuring remarkable durability and resistance to the harsh effects of combustion and environmental exposure. Its double-skinned design, comprising a smooth inner liner and a robust, convoluted outer layer, guarantees that your chimney operates safely and efficiently. The product’s unique single strip manufacturing process, combined with the Omega-Lock seam system, ensures a secure fit that minimises any potential leakage.
Key Features and Their Benefits
• High-Quality Material: The use of 316L stainless steel not only extends the lifespan of the liner but also provides excellent resistance to corrosion and extreme temperatures. This means your investment is protected for the long term.
• Double-Skinned Design: The smooth inner layer enhances the flow of combustion gases while the outer convoluted design provides additional insulation and protection. This dual design maximises performance and longevity.
• Omega-Lock Seam: A reliable sealing mechanism that ensures a continuous and secure joint throughout the liner. This feature significantly reduces the risk of gas leaks, making it a safe choice for your home.
• Multi-Fuel Compatibility: Suitable for various fuels including wood, oil, gas, coal, coke, cured dry logs, and cured dry peat, the liner is versatile enough to meet the demands of modern heating systems.
• Certified and Approved: With both HETAS approval and CE certification, the 316L Mi-FLEX liner meets rigorous safety standards, providing you with peace of mind regarding its quality and performance.
• Lifetime Warranty: When installed with our optional Screw-FIX accessories, this product comes with a lifetime warranty, ensuring your peace of mind and long-term satisfaction.
Installation and Maintenance Guidance
Proper installation is critical to ensure the optimal performance of your flue liner. It is essential to measure the interior of your chimney before installation to confirm compatibility. A thorough chimney sweep is recommended prior to installation to remove any debris that could compromise the effectiveness of the liner.
While many customers choose to install the 316L Mi-FLEX themselves, professional assistance is recommended to guarantee a perfect fit and secure placement. The installation manual provides detailed instructions and safety tips. If additional fixation is required, consider our optional Screw-FIX accessories which are designed to work seamlessly with this product. These accessories offer enhanced security and contribute significantly to the overall performance and longevity of the installation.
Regular maintenance is also a key consideration. It is advisable to schedule an annual sweep for chimneys serving solid fuel appliances. This not only maintains the efficiency of the flue liner but also extends its service life. Routine checks and timely maintenance can prevent costly repairs in the future and ensure that the system remains in top condition.
Addressing Common Concerns
Many customers might be wondering if the 316L Mi-FLEX liner will fit their specific chimney configuration. We recommend a quick test installation by lowering a section of the liner into the chimney to verify fit and ease of movement. This simple check can alleviate any concerns before committing to a full installation.
Another common query revolves around the product’s durability. Thanks to its high-grade stainless steel construction and robust design, this liner is built to withstand the rigours of daily use and the challenging environment inside a chimney. Moreover, the lifetime warranty (available with Screw-FIX accessories) is a testament to its long-term reliability.
Optional Accessories and Their Benefits
To achieve a perfect and secure installation, consider enhancing your setup with optional accessories. Screw-FIX components, for example, provide additional stability and are recommended to complement the 316L Mi-FLEX liner. These accessories ensure the liner remains securely in place, even in challenging conditions, thereby maximising both safety and efficiency. Exploring these options can help you tailor the installation to your specific needs.
Final Thoughts
The 316L Mi-FLEX 125mm x 44m COIL offers a comprehensive solution for modern chimney relining. It combines high-quality materials, an innovative design, and rigorous safety standards to deliver a product that is both reliable and efficient. With easy installation guidelines and the benefits of optional accessories, ensuring a secure fit has never been simpler. Above all, this flue liner is an investment in safety, efficiency, and long-term performance for your home.
When you choose National Flues, you are not only opting for a superior product, but you are also gaining access to expert advice and industry-leading service. Every component, from the high-grade stainless steel construction to the reliable Omega-Lock seam, has been designed with your safety and convenience in mind.
Buy now or call 01670 206 999.
Invest in your home's safety and efficiency—buy now and experience the National Flues difference!
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