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MI-FLEX Adaptor 1mm - Ø 150 (20-150-MAE1)

National Flues proudly presents the MI-FLEX Adaptor 1mm - Ø 150, a premium chimney flue adaptor designed to flawlessly connect your rigid flue systems to MI-FLEX flexible liners. This high-quality stainless steel component is compatible with wood, oil, gas, and smokeless coal, making it an essential accessory for efficient and safe chimney installations. Enhance your system with complementary MI-FLEX accessories – including fire cement, ceramic rope, and high-temperature sealants – all available Read more...
The price you pay today £43.99
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At a Glance

    Made from durable 316L stainless steel with a natural finish
    Seamlessly connects rigid flue systems to MI-FLEX flexible liners
    Suitable for wood (under 20% moisture), oil, gas and smokeless coal
    Withstands temperatures up to 600°C (T600) for reliable performance
    Compliant with Building Regulations Document J
    Provides a gas-tight connection when used with proper sealants
    Part of the comprehensive MF20 MI-FLEX accessory range
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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We will match any price, like-for-like, on a retail basis. Give us a call if you find it cheaper and want to buy from us.

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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: [email protected]

The MI-FLEX Adaptor 1mm - Ø 150 is designed to provide a seamless connection between a single wall rigid flue system and a MI-FLEX 316 or 904 flexible flue liner with the same nominal diameter. This adaptor is part of our MF20 MI-FLEX accessory range, ensuring a comprehensive chimney system when used in conjunction with MI-FLEX liners. Perfect for multiple fuel types, including wood with less than 20% moisture, smokeless coal, gas, and oil, it handles temperatures up to 600°C.

Compliance with Building Regulations Document J is crucial, as it's essential that flexible flue liners are completely enclosed within a masonry chimney. Any exposed flex must be avoided and connections should be gas-tight, using fire cement, ceramic rope, tape, or high-temperature sealant. Regular maintenance, including sweeping by a competent person, ensures optimal performance and longevity of your chimney system.

SKU: 20-150-MAE1

Technical Specifications
Adaptor Diameteru00d8 150
Wall Thickness1mm
Material316L Stainless Steel
Temperature RatingUp to 600u00b0C (T600)
Fuel CompatibilityWood (<20% moisture), Oil, Gas, Smokeless Coal
ApprovalsHETAS / CE
System RangeMI-FLEX Accessories MF20
FinishNatural / Stainless Steel
Installation Instructions & Warnings: • Ensure the adaptor is fitted by a competent professional to maintain the integrity of your chimney system. • The adaptor is designed to connect a rigid flue system to a MI-FLEX flexible liner; verify that both components have matching nominal diameters. • It is essential to completely enclose the flexible flue liner within a masonry chimney as per Building Regulations Document J. Exposed flex or non-masonry enclosures (e.g. timber or plasterboard boxing) are not acceptable. • Achieve a gas-tight seal by applying fire cement, ceramic rope, tape, or a high-temperature sealant at the connection points. • Regular maintenance, including sweeping and inspection by a qualified chimney sweep (especially for solid fuel applications), is recommended to ensure longevity and safe operation. • Before installation, review all manufacturer instructions and local regulations to ensure compliance.

The MI-FLEX Adaptor is suitable for wood with less than 20% moisture, smokeless coal, gas, and oil.

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

The MI-FLEX Adaptor can handle temperatures up to 600°C (T600 designation).

Regular sweeping and inspection should be carried out by a competent person at least once a year, and twice a year for solid fuel appliances.

Use fire cement, ceramic rope or tape, or high-temperature sealant to secure the bottom fixing into the connecting flue and flexible liner.

No, flexible flue liners must be enclosed within a masonry chimney. Non-masonry enclosures like timber or plasterboard boxing are not acceptable.

For solid fuel applications, you can find a list of HETAS registered sweeps at www.hetas.co.uk.

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