Welcome to National Flues Ltd! We use cookies to power essential features and personalise your experience, ensuring a smooth, secure, and ever-improving journey on our website. Your privacy is our priority—cookies help us remember your preferences and enhance your visit without compromising your data. By continuing to browse, you agree to our use of cookies as detailed in our Cookie Policy. Enjoy your visit and thank you for choosing us!
Cookie Preferences
We use different types of cookies for various purposes. Please select which you allow:
MI-FLEX Adaptor - Ø 300
Discover the superior MI-FLEX Adaptor Ø 300 by National Flues. Our premium 316L stainless steel adaptor seamlessly connects ridged flue systems to MI-FLEX flexible liners, ensuring a secure and compliant chimney installation. Enhancing safety and efficiency, this essential component is ideal for woo... More...
Discover the superior MI-FLEX Adaptor Ø 300 by National Flues. Our premium 316L stainless steel adaptor seamlessly connects ridged flue systems to MI-FLEX flexible liners, ensuring a secure and compliant chimney installation. Enhancing safety and efficiency, this essential component is ideal for wood, oil, gas, and smokeless coal applications. Trust National Flues as your partner in quality, reliability, and exceptional performance. Less...
Hover to Zoom / Click for Gallery
Low Stock! – Order Now
Now only
£35.49
Including VAT
Buy with confidence. If you find this cheaper within 48 hours of checkout, we'll refund the difference.
At a Glance
Constructed from high-quality 316L stainless steel (0.6mm thick)
Seamlessly connects ridged single wall flue systems to MI-FLEX flue liners
Provides a gas-tight seal when installed correctly
Withstands temperatures up to 600°C (T600 designation)
Suitable for wood (with <20% moisture), oil, gas, and smokeless coal
Compliant with BSEN 1856-2 standards and Building Regulations Document J
×
Email Product
Enter your email address to send the product details:
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.
Bulk Purchasing Power: We sell a lot, so we can negotiate better rates with suppliers, passing the savings directly to you.
Operational Efficiency: We have streamlined processes to reduce overhead.
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.
The MI-FLEX Adaptor - Ø 300 is a high-quality, 0.6mm 316 stainless steel fitting designed to seamlessly connect a ridged single wall flue system to a MI-FLEX flexible flue liner of the same diameter. Essential for creating a complete and efficient chimney system, this adaptor ensures a gas-tight seal when correctly installed inside an existing masonry chimney. It's suitable for use on a variety of fuel sources including wood (with less than 20% moisture), smokeless coal, gas, and oil, and can withstand temperatures up to 600°C (T600 designation).
To comply with Building Regulations Document J, it’s vital that the flexible flue liner is fully enclosed within a masonry chimney, never boxed in with timber or plasterboard. This adaptor, part of the MF20 MI-FLEX accessories range, makes it easy to transition between your flue system and liner, enhancing both safety and efficiency.
SKU: 20-300-MAE
Technical Specifications
SKU
20-300-MAE
Material
316L Stainless Steel, 0.6mm
Size
Ø 300 mm
Temperature Rating
Up to 600°C (T600 designation)
Approvals
HETAS / CE
Fuels
Wood (<20% moisture), Smokeless Coal, Gas, Oil
Designation
BSEN 1856-2 T600 N1 W V2 L50012 G
System
MI-FLEX Accessories MF20
Installation must be performed within a masonry chimney in accordance with Building Regulations Document J. Ensure the flexible flue liner is fully enclosed within the chimney and never boxed in with timber or plasterboard. When installing, utilise approved sealing methods such as fire cement, ceramic rope, tape, or other high-temperature sealants to create a reliable, gas-tight joint. Carefully follow the manufacturer’s instructions, and consider engaging a professional if you are unsure about any part of the installation process.
The MI-FLEX Adaptor - Ø 300 is constructed from high-quality 0.6mm 316 stainless steel.
Yes, the adaptor is suitable for use with wood (less than 20% moisture), smokeless coal, gas, and oil.
No, the MI-FLEX Adaptor must be used within a masonry chimney as per Building Regulations Document J.
The MI-FLEX Adaptor can withstand temperatures up to 600°C (T600 designation).
Sweep your chimney at least once a year, but if using solid fuels, twice a year is recommended: at the end of the heating season and the start of the next.
Fire cement, ceramic rope, tape, or high-temperature sealant should be used to secure the adaptor and ensure a gas-tight seal.
For solid fuel applications, you can find a HETAS registered chimney sweep at www.hetas.co.uk.
Delivery Information +
We work relentlessly to ensure you get your order fast.
Estimated delivery for this product is Tuesday, April 8th.
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. If you find it cheaper within 48 hours, we'll refund the difference.
Read our buyers guide for this MI-FLEX Adaptor - Ø 300
MI-FLEX Adaptor Ø 300 Buyers Guide
The MI-FLEX Adaptor Ø 300 is an essential component for homeowners and heating professionals seeking a reliable connection between rigid flue systems and flexible MI-FLEX flue liners. In this guide, we will provide a comprehensive overview of the product, explain its benefits, address common concerns, and offer advice on installation and maintenance. Our aim is to give you all the information you need to make a confident and informed purchase.
Product Overview
Crafted from 316L stainless steel with a sleek natural finish, the MI-FLEX Adaptor Ø 300 is designed to provide a robust, durable, and secure connection in your chimney system. With its high-temperature resistance of up to 600°C and compliance with BSEN 1856-2 standards, the adaptor meets the rigorous demands of modern heating systems. Whether you use wood (with less than 20% moisture), smokeless coal, oil, or gas, this adaptor is engineered to perform reliably across a range of fuel types.
Key Benefits
• Durability and Strength: 316L stainless steel construction ensures that this adaptor withstands harsh conditions and remains corrosion-free over its lifespan, ensuring longevity and peace of mind.
• Enhanced Safety: The gas-tight seal created by the adaptor plays a vital role in preventing dangerous leaks, thereby enhancing the overall safety of your chimney system.
• Versatile Application: Suitable for a variety of fuels, the adaptor is an ideal solution for both residential and commercial applications, making it a versatile component in the MI-FLEX range.
• Compliance and Quality: Fully compliant with Building Regulations Document J and possessing HETAS/CE approvals, this product offers guaranteed quality and adherence to industry standards.
Installation Guidelines
Proper installation is crucial for the performance of your chimney system. The following steps and considerations will help ensure a successful installation:
1. Pre-Installation Check: Verify that your masonry chimney is suitable for the installation. The adaptor must be used within a masonry structure and should not be installed in a system boxed in with timber or plasterboard.
2. Sealant Selection: Use high-temperature sealants, such as fire cement, ceramic rope, or specialised tape, to secure the adaptor in place. This step is critical for achieving and maintaining a gas-tight connection.
3. Consult the Regulations: Always refer to Building Regulations Document J and ensure that your installation complies with all local safety standards. If in doubt, consult with a HETAS registered chimney sweep.
4. Professional Assistance: While many homeowners can install the adaptor themselves, engaging a professional installation service may be beneficial, particularly for those unfamiliar with chimney systems.
Addressing Common Concerns
Will the adaptor work with all fuel types?
Yes, the MI-FLEX Adaptor Ø 300 is designed to work with multiple fuel types including wood (with moisture content less than 20%), smokeless coal, gas, and oil. Its robust design and high-performance characteristics mean it can safely accommodate different heating requirements.
Is the product safe for use in masonry chimneys?
Absolutely. The adaptor is specifically designed for chimney installations within masonry structures, ensuring that it meets high standards of safety and performance whilst complying with current building regulations.
How do I maintain the chimney system?
Regular maintenance is necessary to ensure that your chimney system continues to operate safely and efficiently. We recommend sweeping your chimney at least once a year – and twice a year if using solid fuels. Routine checks for any signs of wear or compromise in the seal are advisable to prevent any potential hazards.
What if I need accessories?
National Flues offers a wide range of MI-FLEX accessories designed to complement this adaptor. From additional adaptors to complete flue liners, you can explore a variety of options to create a fully compliant and efficient chimney system. Simply check our website or contact us for more information.
Why Choose National Flues?
National Flues is committed to providing high-quality, affordable heating solutions supported by expert advice and reliable nationwide delivery. Our products are designed with the end user in mind, providing both performance and compliance to guarantee your safety and satisfaction. With competitive pricing and an extensive range of accessories to complement your chimney system, choosing National Flues means investing in long-term reliability and efficiency.
Final Recommendations
When installing a chimney system, every component must function flawlessly together. The MI-FLEX Adaptor Ø 300 not only ensures a secure link between flue systems and liners but also complies with stringent safety standards. This level of performance is essential for keeping your home safe and your heating system efficient. Remember, a well-connected and regularly maintained chimney system is key to preventing hazards and ensuring long-term durability.
In summary, the MI-FLEX Adaptor Ø 300 offers an optimal solution for anyone looking to upgrade or repair their chimney system. By choosing this adaptor, you are selecting a product that combines safety, design, and compliance with top-notch performance. Our detailed guide has aimed to address all your concerns, outline the benefits, and provide clear instructions for installation, ensuring you have a comprehensive understanding of the product.
For additional support, please feel free to contact our dedicated customer service team who can offer expert advice and tailored solutions for your specific requirements. National Flues is your trusted partner in creating safe and efficient heating systems.
Buy now or call 01670 206 999.
National Flues Ltd Verdict
The MI-FLEX Adaptor - Ø 300 is a reliable and essential component for anyone using MI-FLEX 316 and 904 flexible flue liners. Delivering nationwide, we cater to both retail and trade customers, making top-quality fireplace and flue products accessible to everyone.
The MI-FLEX Adaptor - Ø 300 is designed to connect rigid single-wall flue systems to MI-FLEX flexible flue liners, ensuring a safe and efficient transition in a complete chimney system.
National Flues is a trusted supplier of fireplaces and flue systems, renowned for competitive pricing, reliable nationwide delivery, and a strong commitment to serving both retail and trade customers.
Ensure safety and efficiency in your home with our MI-FLEX Adaptor – add to cart now!
