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Increasing MI-FLEX Adaptor - Ø 125-Ø 150

National Flues presents the Increasing MI-FLEX Adaptor – Ø 125-Ø 150, a leading choice for those seeking durable and efficient MI-FLEX accessories. This high-quality 316L stainless steel adaptor provides a seamless and reliable transition between your single wall flue and MI-FLEX flue liner, ensurin... More...
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At a Glance

  • Premium 316L stainless steel construction
  • Robust 0.6mm thickness for enhanced durability
  • Heat resistance rated up to 600°C (T600)
  • Seamless connection between single wall flue and MI-FLEX liner
  • Compliant with Building Regulations Document J
  • Versatile for wood, oil, gas, and smokeless coal appliances
Now only £21.99
Including VAT Buy with confidence. If you find this cheaper within 48 hours of checkout, we'll refund the difference.

 

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The Increasing MI-FLEX Adaptor - Ø 125-Ø 150 is a high-quality 0.6mm 316 stainless steel accessory designed for seamless transition and connection between a single wall connecting flue system and an MI-FLEX flexible flue liner. Constructed to withstand temperatures up to 600°C (T600 designation), it is suitable for use with wood (less than 20% moisture), smokeless coal, gas, and oil appliances. This adaptor is essential for forming a complete chimney system in compliance with Building Regulations Document J, requiring a fully enclosed masonry chimney.

Do not use non-masonry enclosures like timber or plasterboard. Ensuring a gas-tight seal at the bottom fixing, the connection should be secured within the masonry chimney, utilizing fire cement, ceramic rope or tape, or high-temperature sealant. Regular sweeping and maintenance by a competent person are vital, especially for solid fuel appliances.

Use only appropriate cleaning tools, avoiding chemical cleaners and mild steel tools. Recommended sweeping twice a year ensures the longevity and safety of your chimney system.

SKU: 20-125-MR

Technical Specifications
Model20-125-MR
Material316L Stainless Steel
Thickness0.6mm
Heat RatingT600 (Up to 600u00b0C)
FinishNatural / Stainless Steel
Compatible FuelsWood (with less than 20% moisture), Oil, Gas, Smokeless Coal
CertificationsHETAS / CE
SystemMI-FLEX Accessories MF20
Installation MethodSecured within a masonry chimney using fire cement, ceramic rope or tape, or high-temperature sealant
For a compliant and secure installation, fit the Increasing MI-FLEX Adaptor inside your masonry chimney. Secure the connection at the bottom using fire cement, ceramic rope or tape, or a high-temperature sealant to create a gas-tight seal. Ensure the adaptor is installed by a qualified professional following local building regulations. Regular chimney sweeping by a competent person is recommended—twice annually for solid fuel appliances and once a year for gas or oil—to maintain optimum performance and safety. Avoid using chemical cleaners or mild steel tools when performing maintenance on stainless steel components.

The adaptor is constructed from 0.6mm thickness 316 stainless steel, known for its durability and heat resistance.

It is suitable for use with appliances burning wood (with less than 20% moisture content), smokeless coal, gas, and oil, handling temperatures up to 600°C.

Yes, it complies with Building Regulations Document J which mandates that flexible flue liners must be enclosed within a masonry chimney.

The adaptor should be used inside a masonry chimney, secured using fire cement, ceramic rope or tape, or high-temperature sealant to create a gas-tight seal.

For chimneys serving solid fuel appliances, sweeping is recommended twice annually - post-heating season and pre-next heating season. Gas and oil lines should be inspected and cleaned at least once a year.

Avoid chemical cleaners and mild steel tools on stainless steel chimneys. Use appropriate brushes and tools to protect the integrity of the system.

For solid fuel applications, HETAS registered sweeps can be found at hetas.co.uk. Ensure sweeping and maintenance are carried out by competent persons.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Wednesday, April 2nd. 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 Increasing MI-FLEX Adaptor - Ø 125-Ø 150

National Flues Ltd Verdict

Our Increasing MI-FLEX Adaptor - Ø 125-Ø 150 is a top-notch fitment, designed with precision to connect single wall flue systems to MI-FLEX flexible flue liners. With nationwide delivery and reliability that retail and trade customers can trust, National Flues rarely gets beaten on price.

The Increasing MI-FLEX Adaptor - Ø 125-Ø 150 serves as a crucial component for connecting a single wall flue system to MI-FLEX flexible flue liners, ensuring a stable and compliant transition within masonry chimneys.

National Flues is a trusted supplier of high-quality fireplaces and flues across the UK, offering competitive prices and reliable delivery for both retail and trade customers.

 

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