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Top clamp - Ø 100 (20-100-C)

National Flues proudly presents the Top Clamp Ø 100, a premium chimney accessory designed for secure installation of MI-FLEX flexible flue liners. This top clamp, crafted from high-quality 316L stainless steel, offers reliable support for your chimney system and complies with Building Regulations. Ideal for a variety of fuel types including wood, oil, gas, and smokeless coal, our product is indispensable for ensuring the long-term stability and safety of your heating system. Discover our range o Read more...
The price you pay today £11.99
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At a Glance

    Made from high-grade 316L stainless steel for exceptional durability
    Specifically engineered for MI-FLEX flexible flue liners
    Provides secure, vertical support for chimney systems
    Compliant with Building Regulations Document J
    Suitable for wood, smokeless coal, gas, and oil applications
    Works perfectly with a top plate and top insert sleeve for additional stability
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.

We Won't Be Beaten On Price

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:

  • Daily Price Matching: Our team adjusts prices to ensure we stay competitive.
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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 Top Clamp Ø 100 from National Flues is an essential component designed for use with MI-FLEX 316 and 904 flexible flue liners. Part of the MF20 MI-FLEX accessories, this top clamp plays a crucial role in securing the vertical weight of your flue liner, ensuring a stable and fully operational chimney system. This fitting is indispensable for those seeking to comply with Building Regulations Document J, which mandates the use of enclosed masonry chimneys for flexible flue liners.

Ideal for appliances operating up to 600°C (T600 designation), it is compatible with wood burning (moisture content < 20%), smokeless coal, gas, and oil. The clamp functions perfectly with a Top Plate and Top Insert Sleeve to support the liner at the stack's top, ensuring weatherproofing and structural integrity.

SKU: 20-100-C

Technical Specifications
SKU20-100-C
Product NameTop Clamp - u00d8 100
Rating9.7/10
Material316L Stainless Steel
Colour FinishNatural / Stainless Steel
SystemMI-FLEX Accessories MF20
ApprovalsHETAS / CE
Temperature RatingUp to 600u00b0C
Fuel CompatibilityWood, Oil, Gas, Smokeless Coal
StockIN STOCK (38)
Pricingu00a36.46 (Our Price), u00a39.49 (Retail)
Before installation, ensure your chimney is a fully enclosed masonry structure in compliance with Building Regulations Document J. The Top Clamp Ø 100 must be fitted along with a compatible top plate and top insert sleeve, which together distribute the vertical load of the flue liner. Verify proper weatherproofing and structural integrity prior to installation. It is essential that the installation is executed by a competent professional. Regular annual inspections and bi-annual sweeping for solid fuel applications are recommended to maintain optimal performance and safety.

The Top Clamp Ø 100 is used to support the vertical weight of MI-FLEX flexible flue liners, working in conjunction with a Top Plate and Top Insert Sleeve to provide essential stability at the top of the chimney stack.

Yes, it is suitable for use with wood (moisture content < 20%), smokeless coal, gas, and oil, making it highly versatile for various heating systems.

Yes, the chimney stack must be fully weatherproofed, structurally sound, and all chimney pots must be in good condition with appropriate flaunching at the top of the stack.

Absolutely. It complies with Building Regulations Document J, which requires flexible flue liners to be installed within a fully enclosed masonry chimney.

The chimney system should be cleaned and inspected at least once a year. For solid fuel appliances, it is recommended to sweep the chimney twice a year - at the end of the heating season and at the start of the next season.

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

Chimney sweeping should be carried out by a competent person. For solid fuel applications, it is recommended to use HETAS registered sweeps.

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