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Top Clamp - Ø 150 (20-150-C)

National Flues presents the Top Clamp Ø 150, a key accessory in the secure installation of flexible flue liners. Formulated to work seamlessly with MI-FLEX 316 and 904 flue liners, this product is a critical component in ensuring the safety and stability of your chimney system. Ideal for various fuel types, including wood, oil, gas, and smokeless coal, the Top Clamp Ø 150 is engineered for durability and high performance. Enhance your chimney setup with this essential, reliable support accessory Read more...
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At a Glance

    Robust construction in 316L stainless steel
    Designed for flexible flue liners (MI-FLEX 316 & 904)
    Handles high temperatures up to 600°C (T600 rating)
    Complies with HETAS, CE and Building Regulations (Doc J)
    Compatible with wood (under 20% moisture), oil, gas, and smokeless coal
    Essential support element for chimney stack installations
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 Clamp Ø 150 is a vital component in the installation of flexible flue liners. Specifically designed for use with MI-FLEX 316 and 904 flue liners, this top clamp ensures a secure and stable fit at the top of your chimney stack. It's perfect for multi-fuel applications, handling temperatures up to 600°C (T600 designation), and works seamlessly with wood (under 20% moisture), smokeless coal, gas, and oil appliances.

Compliance with Building Regulations Document J is essential, stipulating that flexible flue liners must be enclosed in a masonry chimney. Before installation, ensure your chimney stack's structure is sound, all chimney pots are crack-free, and proper flaunching is applied at the stack's top. Ensure your chimney system allows for easy sweeping and maintenance by professional sweeps, ideally twice a year for solid fuel applications.

SKU: 20-150-C

Technical Specifications
SKU20-150-C
Material316L Stainless Steel
Sizeu00d8 150
Temperature Rating600u00b0C (T600)
ComplianceHETAS / CE, Building Regs Doc J
SystemMI-FLEX Accessories MF20
Compatible FuelsWood (under 20% moisture), Oil, Gas, Smokeless Coal
ApprovalsHETAS / CE
- Use in conjunction with the Top Plate and Top Insert Sleeve for complete support. - Ensure your chimney stack is solid, with crack-free chimney pots. - Flaunching must be correctly applied at the top of the stack to enhance stability. - Installation should only be performed in a masonry chimney as required by Building Regulations Document J. - Regular maintenance and sweeping (at least twice a year for solid fuel appliances) are recommended to keep your system safe and efficient.

The Top Clamp Ø 150 is used to support the vertical weight of a flue liner within a chimney stack, ensuring stability and safety.

Yes, it is suitable for use with appliances that reach up to 600°C (T600 designation).

The Top Clamp Ø 150 is compatible with wood (with less than 20% moisture), smokeless coal, gas, and oil.

Yes, it complies with Building Regulations Document J, requiring flexible flue liners to be installed within a masonry chimney.

You will need a Top Plate and a Top Insert Sleeve to correctly support the weight of the flue liner at the chimney stack's top.

For solid fuel applications, it's recommended to sweep the chimney at least twice a year: once at the end of the heating season and once at the start of the next season.

Ensure the chimney system allows for easy sweeping and maintenance. Avoid using chemical cleaners or mild steel tools on stainless steel chimneys.

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