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Joiner - Ø 250 (20-250-J)
National Flues presents the Joiner Ø 250 – a superior accessory for connecting MI-FLEX flexible flue liners in multi-fuel chimney systems. This high-quality joiner is essential for any installation requiring the seamless joining of chimney flue sections, making it an ideal choice for wood, smokeless coal, oil, and more. Explore our range of MI-FLEX accessories to complete your system with precision and reliability.
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In Stock
£95.99
Give us a call if you find it cheaper and we'll try to price match.
At a Glance
Designed for seamless joining of MI-FLEX multi-fuel flue liners
Crafted from high-quality 316L stainless steel with a natural finish
Supports multi-fuel applications including wood (with < 20% moisture), smokeless coal, oil, and gas (except gas liners)
Endorsed for high temperature use up to 600°C (T600 designation)
Complies with Building Regulations Document J for masonry-enclosed chimneys
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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:
Daily Price Matching: Our team adjusts prices to ensure we stay competitive.
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“I saved 20% on my purchase compared to other retailers. Exceptional service!” – Jane D.
The Joiner Ø 250 from National Flues is an essential accessory for the seamless installation of MI-FLEX 316 and 904 flexible flue liners, creating a full chimney system. Ideal for multi-fuel appliances, it supports applications up to 600°C (T600). Use it for wood with less than 20% moisture, smokeless coal, gas, and oil.
Note: This joiner is not suitable for gas liners and should only be used when the chimney liner length exceeds the maximum available flex length. Ensure your chimney is masonry-enclosed, never within timber or plasterboard boxing, to comply with Building Regulations Document J.
SKU: 20-250-J
Technical Specifications
SKU
20-250-J
Material
316L Stainless Steel
Colour Finish
Natural / Stainless Steel
System
MI-FLEX Accessories MF20
Approvals
HETAS / CE
Temperature Rating
Up to 600u00b0C (T600)
Fuel Compatibility
Wood (<20% moisture), Smokeless Coal, Oil, Gas (Note: Not suitable for gas liners)
Installation Requirement
Masonry-enclosed chimney (not for timber or plasterboard boxing)
Before installation, verify that your chimney is masonry-enclosed as required by Building Regulations Document J. The Joiner Ø 250 must be used only when the flue liner length exceeds the maximum available flexible length. It is vital to note that this joiner is not designed for use with gas liners. Prior to use, ensure that all connections are secure and that the joiner is installed in accordance with the manufacturer’s guidelines. Always consult a HETAS registered professional for chimney sweeping and maintenance to guarantee safety and compliance.
The Joiner Ø 250 is designed for use with MI-FLEX 316 and 904 flexible flue liners.
No, the Joiner Ø 250 should not be used on gas liners. It is meant for multi-fuel applications.
The Joiner Ø 250 is suitable for use on appliances with temperatures up to 600°C (T600 designation).
The joiner is suitable for wood with less than 20% moisture, smokeless coal, gas, and oil.
Flue liner systems should be inspected and cleaned at least once a year. For solid fuel appliances, it’s recommended to sweep the chimney twice a year.
No, Building Regulations Document J stipulates that flue liners must be enclosed within a masonry chimney. Timber or plasterboard enclosures are not acceptable.
Chimney sweeping must be carried out by a competent person, ideally a HETAS registered sweep for solid fuel applications.
Delivery Information +
We work relentlessly to ensure you get your order fast.
Estimated delivery for this product is Wednesday, April 30th.
If you need faster stove or fireplace delivery please give us a call.
We can often 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. Mi-Flex offers a lifetime guarantee.
Returns for damaged items are covered by insurance; non-damaged returns incur return delivery costs.
Price Match Guarantee +
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.
The Joiner Ø 250 from National Flues is a crucial component for any multi-fuel chimney system that utilises MI-FLEX flexible flue liners. Designed to enable a secure and efficient connection between two flue liner sections, this joiner is especially beneficial when your required liner length exceeds the maximum available flex length. With robust performance, it supports a range of fuels and ensures the longevity of your installation.
Key Features and Advantages
High-Quality Material:
- Crafted from 316L stainless steel, the Joiner Ø 250 offers exceptional durability and corrosion resistance even in high temperature environments.
Versatile Fuel Compatibility:
- Whether you are operating a wood-burning, oil, or smokeless coal appliance, this joiner provides the versatility required for various fuel types, though it is not suitable for gas liners.
Temperature Endurance:
- Rated for use at temperatures up to 600°C (T600 designation), it efficiently manages the heat generated by multi-fuel appliances.
Ease of Installation:
- Specially designed for simplicity, this joiner allows for a secure connection between flue liner parts, minimising installation time and reducing the potential for errors.
Regulatory Compliance:
- Installation with the Joiner Ø 250 adheres to Building Regulations Document J, as long as the chimney is properly enclosed within masonry, offering peace of mind from a safety perspective.
Understanding the Application
The Joiner Ø 250 is ideal when your chimney installation requires a longer flue liner than standard lengths can provide. Its design guarantees that once the flex limit is exceeded, you can safely extend your system without compromising on the performance or safety of your appliance. It is important to remember that while the joiner excels in multi-fuel setups, it is not suitable for gas liners, a critical consideration during planning.
Installation and Maintenance Guidelines
Before installation, ensure that:
- Your chimney is masonry-enclosed. This is a key requirement to comply with Building Regulations Document J, as timber or plasterboard boxing is not permitted for flue systems.
- Only use the joiner in systems where the flue liner length exceeds the available flexible length. This precaution ensures that the connection is mechanical and secured properly.
- All components, including the joiner, are handled and installed by a qualified, HETAS registered professional, particularly if you are dealing with solid fuels.
Maintenance Advice:
- Regular inspection and cleaning of your chimney system are recommended. For systems utilising solid fuels, a bi-annual chimney sweep is advisable, along with an annual inspection to ensure all parts, including the joiner, remain in optimal condition.
Addressing Common Objections
Objection 1: 'Is this joiner compatible with my appliance?'
- The Joiner Ø 250 is designed for use with MI-FLEX 316 and 904 flexible flue liners and is suitable for appliances operating on wood (with less than 20% moisture), oil, and smokeless coal. If your appliance is gas-powered, please note that this joiner should not be used.
Objection 2: 'I am concerned about the longevity of the joiner in harsh conditions.'
- Made from 316L stainless steel, the joiner is engineered to withstand high temperatures and corrosive environments, offering a reliable performance year after year.
Objection 3: 'What about compliance and safety?'
- The Joiner Ø 250 meets the necessary Building Regulations when used within masonry-enclosed chimneys. Its temperature rating of up to 600°C and robust material construction ensure that safety is not compromised.
How to Choose the Right Flue Accessories
When selecting flue accessories, it is important to consider the full range of products available to ensure system compatibility and optimal performance. National Flues offers a comprehensive range of MI-FLEX accessories that are designed to work together seamlessly. The joiner is just one component of a broader system that includes various connectors, flue liners, and support components. If you are building or updating a chimney installation, taking the time to choose high-quality, compatible parts will significantly enhance both system efficiency and safety.
Final Considerations
The Joiner Ø 250 is an essential accessory that realises the full potential of your chimney installation by guaranteeing a secure flue liner connection. Its high-grade material make-up, rigorous testing, and compliance with essential safety regulations underscore why it is recommended by professionals in the industry. When you choose National Flues, you are opting for reliability, quality, and performance. Whether you are a retail customer or a seasoned installer, the benefits of using the Joiner Ø 250 are clear – from improved safety and performance to extended system longevity.
For detailed guidance on your chimney system and to ensure you are selecting the correct accessories for your installation, consider consulting with our in-house experts. It’s always advisable to explore all available options, such as additional flue connectors or insulation products, to create a fully optimised multi-fuel chimney system.
In summary, the Joiner Ø 250 from National Flues stands as a testament to quality and reliability in multi-fuel chimney installations. Its designed efficiency, compliance with building regulations, and compatibility across various fuel types ensure your chimney system runs safely and effectively year-round. Invest in your chimney’s future by choosing the best accessories available.
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