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Top Hat Adaptor - Ø 150 (20-150-THA)

Discover the Top Hat Adaptor - Ø 150 from National Flues, a premium stainless steel flue accessory designed to deliver robust performance in chimney systems. This high-quality fitting is ideal for use with MI-FLEX flexible flue liners, making it an essential component for a seamless and safe chimney assembly. Enhance your set-up with this top-rated accessory and explore our range of complementary products for complete system integration.
The price you pay today £81.99
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At a Glance

    Premium 316L Stainless Steel construction
    Robust 0.6mm thickness for enhanced durability
    Withstands temperatures up to 600°C
    Designed with a rebated connection for easy stove integration
    Features a built-in square cover plate for a gas-tight seal
    Complies with Building Regulations Document J requirements
    Part of the MF20 MI-FLEX Accessories range ensuring system compatibility
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 Top Hat Adaptor - Ø 150 is a premium flue accessory meticulously crafted from 0.6mm 316 stainless steel. This robust adaptor is part of our MF20 MI-FLEX accessories range, ensuring longevity and reliability. Perfectly engineered for use with MI-FLEX 316 and 904 flexible flue liners, this component is essential for creating a complete chimney system.

Designed to withstand temperatures up to 600°C, the Top Hat Adaptor is suitable for use with a variety of appliances including those burning wood with less than 20% moisture content, smokeless coal, gas, and oil. Installation complies with Building Regulations Document J, requiring that flexible flue liners are completely enclosed within a masonry chimney, with no flexible flue on show. Featuring a square cover plate, it ensures a gas-tight seal and seamless transition from the connecting flue to the flexible liner, enhancing both performance and safety.

Easy maintenance and cleaning ensure the system remains efficient, with annual sweeping recommended for solid fuel systems.

SKU: 20-150-THA

Technical Specifications
Material316L Stainless Steel
Thickness0.6mm
Max Temperature600u00b0C
Dimensionsu00d8 150mm
Applicable LinersMI-FLEX 316 & 904
CertificationsHETAS / CE
Design FeaturesSquare cover plate, rebated connection for 100mm flue movement
- Install at the base of the chimney beneath the register plate - Ensure that the flexible flue liner is fully enclosed within a masonry chimney as required by Building Regulations Document J - Secure the adaptor using fire cement, ceramic rope or high-temperature sealant to achieve a gas-tight connection - Verify that the rebated connection permits the connecting flue to slide up 100mm without obstruction - Regularly maintain and sweep the system, particularly for solid fuel appliances, to uphold efficiency and safety

The Top Hat Adaptor - Ø 150 is made from high-quality 0.6mm 316 stainless steel, ensuring durability and resistance to high temperatures.

Yes, the adaptor is suitable for appliances with temperatures up to 600°C, including those burning wood, smokeless coal, gas, and oil.

No, according to Building Regulations Document J, flexible flue liners can only be installed within a masonry chimney. Non-masonry installations are not acceptable.

Chimneys should be swept at least once a year, but for solid fuel appliances, it is recommended to sweep at the end of the heating season and before the start of the next season.

Use appropriate tools for stainless steel chimneys and avoid chemical cleaners or mild steel tools, as these can damage the system. Refer to HETAS for a list of registered chimney sweeps.

Yes, it has a rebated connection allowing the connecting flue to slide up 100mm for easy stove integration and disconnection.

The adaptor requires provisions to secure it firmly, using fire cement, ceramic rope or tape, or high-temperature sealant, ensuring a gas-tight seal.

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