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:
Screw-FIX Long Tail Increaser - Ø 100-125mm
National Flues presents the Screw-FIX Long Tail Increaser - Ø 100-125mm, a premium flue adaptor designed for superior connectivity between ridged single wall flue systems and MI-FLEX flexible liners. Ideal for MI-FLEX installations, this high-quality stainless steel increaser offers a reliable solut... More...
National Flues presents the Screw-FIX Long Tail Increaser - Ø 100-125mm, a premium flue adaptor designed for superior connectivity between ridged single wall flue systems and MI-FLEX flexible liners. Ideal for MI-FLEX installations, this high-quality stainless steel increaser offers a reliable solution for enhancing chimney systems. Whether you are looking for a chimney system increaser, a flue transition adaptor, or simply a dependable accessory to boost your setup, our product is optimised for performance, safety, and regulatory compliance. Less...
Hover to Zoom / Click for Gallery
In Stock
At a Glance
- Premium 316L stainless steel construction for durability and reliability
- Seamless connection between ridged single wall flue systems and MI-FLEX flexible liners
- Compliant with Building Regulations Document J for enclosed flexible liners
- Supports multi-fuel applications including wood, smokeless coal, gas, and oil
- Engineered to handle temperatures up to 600°C (T600 designation)
- Optimised for use with MI-FLEX 316 and 904 flexible flue liners
Now only
£38.49
Including VAT
Buy with confidence. If you find this cheaper within 48 hours of checkout, we'll refund the difference.
×
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 Screw-FIX Long Tail Increaser Ø 100-125mm is a high-quality 0.6mm 316 stainless steel adaptor designed to facilitate a seamless transition between a ridged single wall connecting flue system and a MI-FLEX flexible flue liner. Perfectly engineered for use with MI-FLEX 316 and 904 flexible flue liners, this increaser effectively enhances the overall performance and safety of your chimney system. It is suitable for multi-fuel applications including wood (<20% moisture), smokeless coal, gas, and oil appliances sustaining temperatures up to 600°C (T600 designation).Building Regulations Document J stipulates that a flexible flue liner must be entirely enclosed within a masonry chimney.
The Screw-FIX Long Tail Increaser ensures compliance with these regulations and guarantees a gas-tight seal when used in conjunction with fire cement, ceramic rope, tape, or high-temperature sealant. Regular maintenance and sweeping by a HETAS registered sweep are recommended to prevent blockages and maintain optimum performance.
SKU: 25-100-MRLT
Technical Specifications
Material
316L Stainless Steel
Size
u00d8 100-125mm
Thickness
0.6mm
Maximum Temperature
600u00b0C (T600 designation)
Compatible Liners
MI-FLEX 316 and 904
Fuel Compatibility
Wood (<20% moisture), Smokeless Coal, Gas, Oil
Standards
CE / HETAS, Building Regulations Document J
For effective installation, ensure that the flexible flue liner is fully enclosed within a masonry chimney as per Building Regulations Document J. When fitting the adaptor, apply a high-quality fire cement, ceramic rope, tape, or high-temperature sealant to guarantee a gas-tight seal. It is recommended to consult a HETAS registered sweep for regular maintenance and inspections, ensuring the system remains free from blockages. Optional accessories such as sealing tapes and additional ceramic ropes are available to further enhance the installation process—search our range to find the perfect match for your needs.
The Screw-FIX Long Tail Increaser transitions from 100mm to 125mm.
Yes, it can handle temperatures up to 600°C (T600 designation).
Yes, it is designed to be compatible with both MI-FLEX 316 and 904 flexible flue liners.
It is suitable for wood (<20% moisture), smokeless coal, gas, and oil.
Absolutely. It meets the requirements of Building Regulations Document J, ensuring safe and effective installation within a masonry chimney.
Use fire cement, ceramic rope, tape, or high-temperature sealant to create a gas-tight seal.
Regular cleaning and inspection should be carried out at least once a year. For solid fuel applications, it's recommended to sweep the chimney twice a year.
Delivery Information +
We work relentlessly to ensure you get your order fast.
Estimated delivery for this product is Thursday, April 3rd.
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.
Compatible and other products that may be of interest...
Read our buyers guide for this Screw-FIX Long Tail Increaser - Ø 100-125mm
Comprehensive Buyers Guide for the Screw-FIX Long Tail Increaser - Ø 100-125mm
When planning your chimney system installation or upgrade, choosing the right components is essential for long-term performance and safety. The Screw-FIX Long Tail Increaser is engineered to offer a seamless transition between a ridged single wall flue system and a MI-FLEX flexible flue liner, delivering robust performance while ensuring compliance with Building Regulations. This guide provides detailed insight into the product, its benefits, installation tips, and additional accessories that can further optimise your chimney setup.
Product Overview
The Screw-FIX Long Tail Increaser is manufactured using high-grade 316L stainless steel, providing exceptional durability and resistance to high operating temperatures up to 600°C. Its precision design is particularly suited for connecting ridged flue components to MI-FLEX flexible liners. This connection is crucial in multi-fuel applications as it secures the transition, enhancing both the safety and efficiency of your chimney system.
Key Features and Benefits
- Durability and Strength: Crafted from 316L stainless steel, this adaptor is built to withstand the rigours of high-temperature applications and various fuel types, including wood, smokeless coal, gas, and oil.
- Seamless Integration: The increaser simplifies the connection between different types of flue systems, ensuring that your entire chimney system operates as a unified, gas-tight unit.
- Regulatory Compliance: It adheres strictly to Building Regulations Document J, meaning that your installation will meet the required governmental safety standards.
- Enhanced Safety: A secure, gas-tight seal reduces the risk of harmful leaks, ensuring that your heating system operates safely and efficiently.
- Flexibility in Use: Whether you are upgrading an existing system or installing a new one, this adaptor is designed for both residential and commercial applications.
Installation Guidelines
Proper installation is critical to ensure optimal performance and long-term reliability of the increaser. It is imperative to fully enclose the flexible flue liner in a masonry chimney, as stipulated by Building Regulations Document J. During installation, use fire cement, ceramic rope, tape, or a high-temperature sealant to create a secure seal. These accessories are optional yet highly recommended to guarantee the system remains gas-tight over time. Professionals advise that you have the system inspected and maintained regularly by a HETAS registered technician to prevent any blockages or performance issues.
Optional Accessories and Customisation
For those looking to further improve their installation, a range of optional accessories is available. These include:
- Fire Cement: Provides additional bonding strength and helps maintain the integrity of the seal.
- Ceramic Rope: Offers a flexible sealing solution that conforms to the shape of the adaptor for a perfect fit.
- High-Temperature Sealant: Ensures long-lasting adherence even in extreme heat conditions.
- Sealing Tape: An economical and effective option for achieving a tight seal around the joint.
Integrating these accessories can significantly enhance the longevity and safety of your chimney system, ensuring that every connection point is secure. We encourage users to explore our full range of products to find the accessories that best suit their needs.
Addressing Common Questions
Q: Is the Screw-FIX Long Tail Increaser suitable for all types of flue liners?
A: Yes, it is specifically designed to work with both MI-FLEX 316 and 904 flexible liners, making it a versatile option for various installations.
Q: What fuel types are supported by this product?
A: The adaptor is compatible with multi-fuel applications including wood (with less than 20% moisture), smokeless coal, gas, and oil.
Q: Do I need additional accessories for installation?
A: While the Screw-FIX Long Tail Increaser provides a secure connection on its own, using complementary accessories such as fire cement or ceramic rope is recommended to achieve a completely gas-tight seal.
Q: How often should maintenance be carried out?
A: Regular inspections and maintenance by a HETAS registered sweep are recommended to keep the system functioning efficiently, particularly for solid fuel applications where biannual sweeping is advised.
Making Your Purchase Decision
When investing in a product that is critical to the safety and functionality of your chimney system, it is important to consider quality, compatibility, and ease of installation. The Screw-FIX Long Tail Increaser is designed with these factors in mind, offering a high-quality, durable solution that meets rigorous safety standards and enhances overall system performance. Its versatility in handling various fuel types and compatibility with MI-FLEX liners makes it an ideal choice for both residential and commercial installations.
We understand that the decision-making process can be challenging, and thorough consideration of installation requirements, optional accessories, and compliance issues is vital. Our team at National Flues is committed to providing comprehensive support, whether you are a seasoned installer or a first-time buyer. Detailed product guidance and a wide array of optional accessories are available to ensure that every aspect of your chimney system installation is addressed comprehensively.
Final Thoughts
In summary, the Screw-FIX Long Tail Increaser - Ø 100-125mm is a product designed to deliver reliability, safety, and enhanced performance for modern chimney systems. Its robust construction, regulatory compliance, and flexibility make it a preferred choice for ensuring optimal performance of your heating system. When paired with optional sealing accessories, this adaptor not only meets but exceeds the requirements for a high-quality installation. Invest in quality and secure peace of mind with a product that values both performance and safety.
Add to cart today or call 01670 206 999.
National Flues Ltd Verdict
The Screw-FIX Long Tail Increaser Ø 100-125mm is an exceptional addition to any chimney system. Reliable, durable, and perfectly designed to meet all needs for retail and trade customers. We're proud to deliver this high-quality product nationwide and offer it at unbeatable prices.
The Screw-FIX Long Tail Increaser is designed to smoothly connect a ridged single wall flue to a flexible MI-FLEX flue liner, providing a reliable and gas-tight transition.
National Flues is a leading supplier of fireplaces and flues across the UK, known for unbeatable prices, reliable delivery, and high-quality products for both retail and trade customers.
