Free Delivery over £100+ 5on Trustpilot Browse our popular stoves Fast Mainland UK Delivery Buy stoves with install packs Call 01670 206 999 for help

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. Read more...
904L Mi-FLEX 80mm x 44m COIL
IN STOCK
Product Thumbnail
Product Thumbnail
Now only £1,918.99
including free delivery Give us a call if you find it cheaper and we'll normally price match.
  • Fast deliveryFriday, November 14th*
  • Best PriceCall us to beat any price you found online.
  • Secure checkoutCard· Google/Apple Pay· Klarna· Paypal

 

Payment Options

At a Glance

  • Premium 904L stainless steel construction (0.105mm thick inner & outer layers)
  • 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

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.

Have Questions?
Phone: 01670 206999
Email: sales@nationalflues.com

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.

SKU: 36Z-80-44

Delivery Information* +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, November 14th. This is based on current lead times. Bear in mind that it is a busy time of year. If you need a product delivered by a specific time in the next 7 days, then please give us a call on 01670 206 999. Visit our Shipping Information page for more information.

About National Flues Ltd +

We began over 30 years ago as a fireplace shop in the North East. We now supply hundreds of trade professionals and thousands of retail customers, all across the UK, every month. We are still a family owned business, lead by the MD Neil, and always try our best to deliver the best possible experience. We also price match, so give us a call if you find this cheaper and want to buy from us. Visit our about us page to read a bit more.

This is us — real advice over the phone, or at the counter, and real stock in our warehouse.

Customer being served at the National Flues trade counter
Trade counter Installer collection & same-day help.
Team helping customers at the counter
Advice Real people on the phone to spec the right parts.
Friendly member of the team at the front desk
Here to help Friendly, straight answers from HETAS approved experts.
Warehouse shelves with boxed flue components being picked for dispatch
Warehouse Orders picked & dispatched nationwide.
Talk to the team Visit our trade counter
Technical Specifications
Diameter80mm
Length44m
Material904L stainless steel (0.105mm thick inner & outer layers)
SeamOmega-Lock
CertificationHETAS, CE
WarrantyLifetime (with Screw-FIX accessories)
Fuel CompatibilityMulti-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.

 

Call the Experts   8am-5pm
👀 7 people watching this