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MI-FLEX Adaptor - Ø 200 (20-200-MAE)

National Flues presents the MI-FLEX Adaptor - Ø 200, a high-performance flue adaptor engineered for robust and seamless chimney systems. Crafted from premium 316L stainless steel, this adaptor ensures a secure and reliable connection between your rigid flue installations and MI-FLEX flexible liners. Optimised for a range of fuels including wood, smokeless coal, gas, and oil, this adaptor is an indispensable component for any modern chimney system, offering unmatched durability and compliance with Building Regulations Document J.
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At a Glance

    Premium 316L stainless steel construction

    0.6mm thickness for a robust and secure adaptor

    Seamless connection between rigid single wall flue system and MI-FLEX flexible flue liner

    Withstands temperatures up to 600°C (T600 designation)

    Fully compliant with Building Regulations Document J and HETAS/CE approvals

    Suitable for use with wood, smokeless coal, gas, and oil

    In stock and available for reliable nationwide delivery

Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, July 8th. This is based on current lead times for this product. 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 on 01670 206 999. 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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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:

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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 - Ø 200 is meticulously designed for seamless integration with MI-FLEX 316 and 904 flexible flue liners. This 0.6mm thick 316 stainless steel adaptor serves as a transitional joint, ensuring a perfect connection between your rigid single wall connecting flue system and MI-FLEX flue liner of the same diameter. It is ideal for creating a comprehensive and efficient chimney system that complies with Building Regulations Document J, which mandates the complete enclosure of flexible flue liners within a masonry chimney.

This adaptor is suitable for use with a range of fuels, including wood with less than 20% moisture, smokeless coal, gas, and oil, and can withstand temperatures up to 600°C (T600 designation). When installing, make sure the connection to the flex occurs within the masonry chimney and no flexible liner is exposed, using fire cement, ceramic rope, or high-temperature sealant for a gas-tight seal. Regular maintenance and sweeping, preferably twice a year for solid fuel applications, are crucial to ensure the longevity and safety of your system.

SKU: 20-200-MAE

Technical Specifications
SKU20-200-MAE
Material316L Stainless Steel
Thickness0.6mm
Diameter200mm (u00d8 200)
Temperature RatingUp to 600u00b0C (T600)
Fuel CompatibilityWood (with less than 20% moisture), Smokeless Coal, Gas, Oil
ApprovalsHETAS / CE
ComplianceBuilding Regulations Document J
During installation, ensure that the connection between your rigid single wall flue system and the MI-FLEX flexible flue liner is made within the masonry chimney. This is crucial for regulatory compliance and safety. Use high-temperature sealing materials—such as fire cement, ceramic rope, or a high-temperature sealant—to create a gas-tight seal. Avoid exposing any portion of the flexible flue liner outside the chimney structure. Regular maintenance is vital: for solid fuel applications, conduct a thorough sweep at least twice a year. Always have the maintenance carried out by a HETAS registered professional to protect the integrity of your stainless steel components and preserve the overall efficiency of your chimney system.

The MI-FLEX Adaptor - Ø 200 is used to connect a rigid single wall flue system to a MI-FLEX flexible flue liner of the same diameter, creating a seamless and efficient chimney system.

Yes, it can be used with wood (with less than 20% moisture), smokeless coal, gas, and oil.

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

Document J requires flexible flue liners to be completely enclosed within a masonry chimney. Non-masonry enclosures like timber or plasterboard are not acceptable.

The chimney system should be cleaned and inspected at least once a year, but for solid fuel applications, it's recommended to sweep at least twice a year.

You can use fire cement, ceramic rope, tape, or high-temperature sealant to secure the bottom fixing and ensure a gas-tight seal.

Yes, do not use chemical cleaners or mild steel tools to sweep stainless steel chimneys. It is recommended to have the cleaning done by a competent person, preferably a HETAS registered sweep.

What our experts say!

"The MI-FLEX Adaptor - Ø 200 is an essential for any reliable chimney system setup. Its high-quality stainless steel ensures durability and effectiveness. As always, National Flues offers unbeatable prices, dependable nationwide delivery, and service to both retail and trade customers."

The MI-FLEX Adaptor - Ø 200 is designed to connect rigid single wall flue systems to MI-FLEX flexible flue liners of the same diameter.

National Flues is a leading supplier of fireplaces and flues in the UK, known for unbeatable prices, reliable delivery, and exceptional service to both retail and trade customers.

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