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Long Tail Increasing MI-FLEX Adaptor - Ø 125-Ø 150

National Flues presents the Long Tail Increasing MI-FLEX Adaptor (Ø 125-Ø 150), a premium solution crafted in 0.6mm 316 stainless steel for a secure and efficient transition between rigid single wall flue systems and MI-FLEX liners. Perfect for wood, oil, gas, and smokeless coal applications, this a... More...
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At a Glance

  • Robust 0.6mm 316 Stainless Steel Construction
  • Seamless connection from rigid single wall flue to MI-FLEX liners
  • 25mm increase ensures a secure, gas-tight seal
  • Complies fully with Building Regulations Document J
  • Suitable for multiple fuels including wood, oil, gas and smokeless coal
Now only £37.99
Including VAT Buy with confidence. If you find this cheaper within 48 hours of checkout, we'll refund the difference.

 

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

The Long Tail Increasing MI-FLEX Adaptor Ø 125-Ø 150 is meticulously designed to serve as a transitional joint, effortlessly connecting a rigid single wall flue system to MI-FLEX. With a robust construction of 0.6mm thick 316 stainless steel, this adaptor increases by 25mm from the single wall to the flexible flue liner. Ideal for use with MI-FLEX 316 and 904 flexible flue liners, it ensures a secure and stable connection for appliances operating at temperatures up to 600°C (T600 designation).

Perfect for wood with moisture below 20%, smokeless coal, gas, and oil, this adaptor complies with the Building Regulations Document J which mandates that flexible flue liners be entirely enclosed within a masonry chimney. To guarantee optimal performance and safety, ensure that the bottom fixings are secured with fire cement, ceramic rope, or high-temperature sealant, creating a gas-tight seal. Regular maintenance and sweeping, especially for solid fuel applications, are essential to preserve the integrity and functionality of your chimney system.

SKU: 20-125-MRLT

Technical Specifications
Product ID529
SKU20-125-MRLT
Material316 Stainless Steel
Thickness0.6mm
Operating TemperatureUp to 600u00b0C (T600)
Sizeu00d8 125 u2013 u00d8 150
SystemMI-FLEX Accessories MF20
FuelsWood (moisture <20%), Oil, Gas, Smokeless Coal
ApprovalsHETAS / CE
FinishNatural / Stainless Steel
When installing the Long Tail Increasing MI-FLEX Adaptor, first ensure that the flue system and MI-FLEX liner are clean and free from obstructions. Secure the adaptor using appropriate bottom fixings such as fire cement, ceramic rope, or high-temperature sealant to achieve a gas-tight seal. The adaptor is designed for use within a masonry chimney, so it is important to follow Building Regulations Document J. Always double-check that the installation is compliant with local building codes. Regular maintenance, including sweeping and inspections, is recommended—especially for systems used with solid fuels—to ensure the longevity and efficiency of your chimney system. Avoid using chemical cleaners or abrasive tools on the stainless steel to preserve its finish.

The Long Tail Increasing MI-FLEX Adaptor is made from 0.6mm thick 316 stainless steel, ensuring durability and resistance to high temperatures.

Yes, the adaptor is suitable for wood (with moisture content below 20%), smokeless coal, gas, and oil.

Absolutely. It complies with Building Regulations Document J, which requires flexible flue liners to be enclosed within a masonry chimney.

You can secure the adaptor using fire cement, ceramic rope, or high-temperature sealant for a perfect gas-tight seal.

The adaptor is designed to handle temperatures up to 600°C (T600 designation).

Chimneys should be swept at least once a year, ideally twice for solid fuel appliances, at the end and start of the heating season, to ensure the system is free from blockages and deposits.

No, it is not recommended to use chemical cleaners or mild steel tools for cleaning stainless steel chimneys. Always use appropriate methods as specified by HETAS.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Thursday, April 3rd. 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. If you find it cheaper within 48 hours, we'll refund the difference.

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Read our buyers guide for this Long Tail Increasing MI-FLEX Adaptor - Ø 125-Ø 150

National Flues Ltd Verdict

The Long Tail Increasing MI-FLEX Adaptor Ø 125-Ø 150 is an outstanding choice for ensuring a seamless connection between your rigid single wall flue system and MI-FLEX liners. At National Flues, we pride ourselves on offering reliable delivery nationwide and competitive pricing. Trusted by both retail and trade customers.

This adaptor is used for connecting a rigid single wall flue system to MI-FLEX flexible flue liners, ensuring a secure and stable transition within a masonry chimney.

National Flues is a premier supplier of fireplaces and flues across the UK. Known for competitive pricing and reliable delivery, they cater to both retail and trade customers with an extensive range of high-quality products and exceptional service.

 

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Upgrade your chimney system now with the Long Tail Increasing MI-FLEX Adaptor – add to cart or call us on 01670 206 999.

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