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316L Mi-FLEX 80mm x 44m COIL (35Z-80-44)

The 316L Mi-FLEX 80mm x 44m COIL from National Flues offers a premium flue liner solution for relining masonry chimneys across the UK. Crafted from durable 316L stainless steel, this flexible and multi-fuel compliant flue liner is ideal for gas, oil, coal, and more. HETAS approved and CE certified, it ensures safety and efficiency while meeting stringent construction standards. Perfect for both residential and commercial applications, this product delivers exceptional performance and longevity, Read more...
The price you pay today £861.99
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At a Glance

    Premium 316L stainless steel construction
    Durable double-skinned design with Omega-Lock seal
    Versatile for multiple fuel types including gas, oil, coal, coke and more
    HETAS approved and CE certified
    Lifetime manufacturer''s warranty when used with Screw-FIX accessories
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, July 1st. This is based on current delivery times for this product. Delivery for products not in our warehouses can be delayed because of third party carriers. If you need a stove, or other bulky product, to be delivered by a specific time in the next 7 days then please give us a call. We can sometimes 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 and you can read in our blog about they types and terms and conditions for warranties. Mi-Flex flue liner, for example, comes with a lifetime guarantee. Give us a call if you want to know about a specific warranty. Returns for damaged items are covered by insurance; non-damaged returns incur return delivery costs.

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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.

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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.

Have Questions?
Phone: 01670 206999
Email: [email protected]

The 316L Mi-FLEX 80mm x 44m COIL is a premium double-skinned flexible flue liner designed for relining masonry chimneys. Crafted from high-quality 316L grade stainless steel, both the inner and outer liners boast a thickness of 0.105mm, ensuring durability and long-lasting performance. This flue liner is ideal for use with multiple fuels, including gas, oil, coal, coke, cured dry logs, and cured dry peat.

For added reliability, it features an Omega-Lock seal formed by folding the steel in four planes after bending it at 180 degrees. Approved by HETAS and CE certified, the flue liner meets stringent safety and performance standards. Installation is straightforward, with steps to ensure a secure fit from the top of the chimney, emphasizing the importance of pointing the arrows upwards to match the gas flow.

Regular maintenance, such as annual chimney sweeping, is recommended to ensure optimal performance.

SKU: 35Z-80-44

Technical Specifications
SKU35Z-80-44
Dimensions80mm x 44m
Material316L stainless steel (0.105mm inner & outer layers)
DesignDouble-skinned with Omega-Lock seal mechanism
Fuel CompatibilityWood, Oil, Gas, Low sulphur coal, Coke, Cured dry logs, Cured dry peat
CertificationsHETAS approved, CE certified
WarrantyLifetime (with Screw-FIX accessories)
Installation is straightforward when following our recommended guidelines. Begin by fitting the liner from the top of your masonry chimney. Ensure that the directional arrows are aligned upwards to match the gas flow direction, ensuring optimal venting. Secure the liner using the appropriate accessories, such as Screw-FIX fittings, and remember to attach a piece of string to the Nose Cone to pull the liner down carefully into position. Regular maintenance, including an annual chimney sweep, is essential to ensure longevity and performance. Always refer to the detailed installation manual provided by Mi-Flues Ltd for safety precautions and step-by-step guidance.

The flue liner is constructed from 316L grade stainless steel, with a 0.105mm thick smooth inner layer and an equally thick convoluted outer layer.

Yes, the 316L Mi-FLEX flue liner is suitable for burning gas, oil, coal, coke, cured dry logs, and cured dry peat.

The 316L Mi-FLEX flue liner is HETAS approved and CE certified, ensuring it meets high safety and performance standards.

The flue liner should be fitted from the top of the chimney, with the arrows pointing upwards to match the gas flow. It's recommended to secure a piece of string to the Nose Cone and pull the liner down while feeding it from the top.

Both the inner and outer layers of the flue liner are 0.105mm thick, providing durability and reliability.

Chimneys serving solid fuel appliances should be swept and maintained at least once a year to ensure optimal performance and safety.

Yes, it carries a lifetime manufacturer's warranty if installed with Screw-FIX accessories.

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