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Joiner - Ø 200 (20-200-J)

National Flues presents the superior Joiner - Ø 200, a premium connector for MI-FLEX multi-fuel flexible flue liners. Designed for wood-burning, smokeless coal, oil, and gas applications, this essential accessory ensures a secure and efficient chimney system. Read more...
Now only £32.99
Give us a call if you find it cheaper and we'll normally price match.
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At a Glance

  • Essential accessory for connecting MI-FLEX multi-fuel liners
  • Made from durable 316L stainless steel for long-lasting performance
  • Compatible with wood (below 20% moisture), smokeless coal, gas, and oil
  • Fully compliant with Building Regulations Document J
  • Designed exclusively for use within masonry chimneys

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 Joiner - Ø 200 is an essential accessory designed for use with MI-FLEX 316L and 904 flexible flue liners. This joiner is crucial when the length of your chimney liner exceeds the maximum available flex length, allowing two pieces of multi-fuel liner to connect seamlessly. It is critical to note that this joiner must not be used with gas liners.

Compliant with Building Regulations Document J, the MI-FLEX system is only suitable for installation within a masonry chimney – non-masonry enclosures like timber or plasterboard are not acceptable. Rated for use with appliances up to 600°C (T600 designation), it is ideal for wood with less than 20% moisture, smokeless coal, gas, and oil. Regular sweeping and maintenance, preferably by HETAS registered professionals, are essential to ensure longevity and safety.

Solid fuel appliances require more frequent cleaning to prevent build-up and blockages.

SKU: 20-200-J

Delivery Information* +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Monday, November 17th. 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.

Technical Specifications
SKU20-200-J
DesignationBSEN 1856-2 T600 N1 W V2 L50012 G
SystemMI-FLEX Accessories MF20
Material316L Stainless Steel
Colour FinishNatural / Stainless Steel
FuelsWood (below 20% moisture), Oil, Gas, Smokeless coal
ApprovalsHETAS / CE
Rated Temperature600°C
ComplianceBuilding Regulations Document J
Suitable InstallationMasonry chimney only
Ensure that the Joiner - Ø 200 is installed within a masonry chimney as part of a MI-FLEX multi-fuel liner system. Before installation, verify that the chimney liner does not exceed the maximum flexible length available and that each component is compatible. Important: This joiner must not be used with gas liners. Follow the manufacturer’s guidelines strictly and have your installation inspected by a HETAS registered professional. Regular chimney sweeping and maintenance are crucial—especially for solid fuel appliances—to prevent build-up or blockages, ensuring safe operation over time. Always keep the installation area free of combustibles and adhere to all local building regulations.

No, the Joiner - Ø 200 is not suitable for use with gas liners. It is designed specifically for multi-fuel liners.

This joiner can be used with wood (below 20% moisture), smokeless coal, gas, and oil.

Yes, it complies with Building Regulations Document J, which requires that a flexible flue liner be installed fully enclosed inside a masonry chimney.

It’s recommended to sweep chimneys serving solid fuel appliances at least twice a year – once at the end of the heating season and once before the start of the next.

Sweeping and maintenance should be conducted by a competent person. For solid fuel applications, HETAS registered professionals are recommended.

No, you should not use chemical cleaners or mild steel tools on stainless steel chimneys. Regular sweeping is sufficient.

Regular inspections are recommended, especially before and after the heating season, to ensure there are no blockages or deposits such as bird nests.

 

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