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MI-FLEX Adaptor - Ø 150 (20-150-MAE)

Discover the excellence of the MI-FLEX Adaptor - Ø 150 by National Flues, a high-quality 316L stainless steel component engineered for seamless flue transitions. Perfect for multi-fuel heating systems, this adaptable and efficient product is a must-have for those seeking a reliable connection between rigid and flexible flue systems. The MI-FLEX Adaptor brings together performance, safety, and compliance, ensuring your chimney meets all necessary standards.
The price you pay today £24.99
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At a Glance

    Made from 0.6mm thick 316L stainless steel for top durability
    Provides a reliable, gas-tight transition between flue systems
    Compatible with multifuel options including wood, oil, gas, and smokeless coal
    Withstands temperatures up to 600°C (T600 rating)
    Designed for installation within masonry chimneys to comply with Building Regulations Document J
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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Have Questions?
Phone: 01670 206999
Email: [email protected]

The MI-FLEX Adaptor - Ø 150 is a 0.6mm thick 316 stainless steel adaptor specifically designed for seamless connections between a rigid single wall flue system and the MI-FLEX flexible flue liner. This adaptor is vital for achieving a gas-tight transition, ensuring the secure and efficient operation of your heating system. It is suitable for use with multiple fuels including wood with less than 20% moisture, smokeless coal, gas, and oil, and can withstand temperatures up to 600°C (T600 designation).

To comply with Building Regulations Document J, it must be installed entirely within a masonry chimney. The bottom fixings secure the transition neatly within the existing masonry, and additional sealing materials such as fire cement, ceramic rope, or high-temperature sealant are recommended for best results. Maintenance is straightforward, requiring routine sweeping by a competent person and regular inspections to ensure safety and efficiency.

This makes it a versatile, reliable choice for maintaining clean and efficient flue systems.

SKU: 20-150-MAE

Technical Specifications
Material316L Stainless Steel
Thickness0.6mm
Nominal Diameteru00d8 150
Temperature Rating600u00b0C (T600)
Fuel CompatibilityWood (less than 20% moisture), Oil, Gas, Smokeless Coal
ApprovalsHETAS / CE
Installation RequirementMust be fully installed within a masonry chimney
• Ensure the adaptor is installed entirely within a masonry chimney as per Building Regulations Document J. • Use bottom fixings to secure the adaptor firmly, ensuring there is no visible flex at the transition point. • For enhanced sealing, it is recommended to apply additional sealing materials such as fire cement, ceramic rope, or high-temperature sealant around the joint. • Routine maintenance, including regular sweeping by a competent person and periodic inspections, is essential to maintain system efficiency and safety.

Its primary function is to connect a rigid single wall flue system to a MI-FLEX flexible flue liner, ensuring a seamless, gas-tight transition inside a masonry chimney.

The adaptor is made from 0.6mm thick 316 stainless steel, making it durable and resistant to high temperatures and corrosion.

It is compatible with wood (less than 20% moisture), smokeless coal, gas, and oil.

It can withstand temperatures up to 600°C (T600 designation).

It should be installed entirely within a masonry chimney as per Building Regulations Document J. Bottom fixings should secure the adaptor and ensure no flex is visible.

Regular sweeping and inspections are necessary, ideally by a competent person. For solid fuel applications, you should check for blockages and deposits at least twice a year.

No, chemical cleaners and mild steel tools should not be used to sweep stainless steel chimneys as they can cause damage.

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