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Wall Sleeve - Ø 125 (15-125-098)
National Flues brings you the Wall Sleeve - Ø 125mm, a premium accessory designed to protect your chimney flue system as it passes through exterior walls. This robust wall sleeve is ideal for installations involving wood burning stoves, oil boilers, gas heaters and low sulphur coal systems, ensuring safety, durability and compliance with industry standards. With HETAS Approval and CE marking, this product is a reliable and safe investment for any home.
In Stock
£37.99
Give us a call if you find it cheaper and we'll try to price match.
At a Glance
Durable 304/316 stainless steel construction Suitable for wood, oil, gas, and low sulphur coal appliances Easy to install with tapering option for 45° wall passages Fully welded design for robust protection HETAS Approved and CE marked
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Please Note: All dimensions refer to the internal diameter of flues.
If unsure, please call 01670 206999 to ensure you choose the correct products.
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 Wall Sleeve - Ø 125mm is designed to protect your chimney system when passing through an exterior wall. Primarily used with solid fuel and gas/oil appliances such as wood stoves, gas-coal effect fires, and oil and gas boilers, this sleeve ensures durability and safety. Constructed with an outer skin of 304 grade stainless steel and an inner skin of 316 grade stainless steel, both at 0.4mm thick, it offers robust protection.
The insulation is made from compressed Rockwool, offering densities of 200kg/m3 TWPro and 128Kg/m3. All parts are fully welded, providing a seamless and sturdy finish. The distance to combustibles is 50mm for TWPro and 60mm on KC.
TWPro is HETAS Approved and CE marked, ensuring compliance with industry standards. Installation is straightforward, and the sleeve can be tapered for a flush fit when passing through walls at a 45-degree angle, easily cut using a grinder or hacksaw.
Installation is straightforward: Start by positioning the sleeve in accordance with manufacturer instructions. Ensure that when passing through an exterior wall, the gap between the flue pipe and the wall is completely filled with properly compressed Rockwool insulation. For walls that meet at a 45-degree angle, use a grinder or hacksaw to taper the sleeve, securing a flush fit. Always maintain the minimum clearance distances – 50mm for TWPro systems and 60mm for KC systems – to ensure safety around combustibles. Check that all components are fully welded and aligned before completing the installation. If in doubt, refer to the detailed installation guide or consult a qualified professional.
It is suitable for solid fuel and gas/oil appliances, including wood stoves, gas-coal effect fires, and oil and gas boilers.
The Wall Sleeve features an outer skin made from 304 grade stainless steel and an inner skin from 316 grade stainless steel, both 0.4mm thick.
The insulation is made from compressed Rockwool, with densities of 200kg/m3 TWPro and 128Kg/m3.
Installation involves securing TWPro Twin Wall Insulated Chimney parts with a Locking Band and ensuring the required distance from combustibles. The sleeve can be cut to fit using a grinder or hacksaw if passing through walls at a 45-degree angle.
Yes, TWPro is HETAS Approved and CE marked, complying with industry standards.
The distance to combustibles is 50mm for TWPro and 60mm for KC.
Yes, if the flue system goes through the wall at a 45-degree angle, the sleeve needs to be taper-cut to fit flush in the wall.
Delivery Information +
We work relentlessly to ensure you get your order fast.
Estimated delivery for this product is Monday, May 19th. Delivery times of products not in our warehouses depend on product availability and shipping. If you need a definitive delivery time give us a call.
If you need faster stove or fireplace delivery please also 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. 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.
Comprehensive Buyers Guide for the Wall Sleeve - Ø 125mm
When selecting components for your chimney flue system, every element plays a vital role in ensuring both efficiency and safety. The Wall Sleeve - Ø 125mm from National Flues is one of those indispensable components that protects your chimney from potential hazards when passing through an exterior wall. This comprehensive guide is designed to answer all your questions about this accessory and provide the necessary information to help you make a confident purchase decision.
Understanding the Importance of the Wall Sleeve
The wall sleeve is specifically engineered to maintain a safe distance between the hot flue and combustible materials in the surrounding structure. Its principal function is to serve as a barrier that prevents heat transfer to the wall, thereby reducing the risk of fire hazards. Constructed using a dual-layer of 304 and 316 grade stainless steel, the sleeve is built to withstand high temperatures and harsh environmental conditions.
Key Features and Their Benefits
• Durable Construction: Made with 304 and 316 stainless steel, the product offers excellent resistance to corrosion and high temperatures, ensuring longevity even in challenging conditions.
• High-Performance Insulation: The inclusion of compressed Rockwool insulation (available in densities of 200kg/m3 for TWPro and 128kg/m3 for KC) ensures that any heat escaping from the flue is contained, protecting the structure of your home and contributing to overall energy efficiency.
• Custom Fit for Angled Installations: If your installation requires the sleeve to pass through a wall at a 45° angle, it can be easily tapered using common tools like a grinder or hacksaw. This flexibility helps achieve a precise and secure fit, enhancing both safety and aesthetic appeal.
• Certified Safety: With HETAS Approval and CE marking, this wall sleeve adheres to strict safety standards, giving you the confidence that your installation meets all necessary regulations.
Installation Guidelines
The installation process of the Wall Sleeve - Ø 125mm is designed with user convenience in mind. Begin by positioning the sleeve precisely where the flue will traverse the exterior wall. It is critical to ensure that the full gap between the flue and the sleeve is appropriately insulated with compressed Rockwool. In cases where the wall is angled at 45°, the sleeve must be carefully tapered to fit flush, thereby ensuring a seamless installation. Maintaining the mandated safe distances, 50mm for TWPro and 60mm for KC, is also crucial in preventing overheating of adjacent combustible materials. For a detailed, step-by-step guide, always refer to the installation manual or contact a professional installer for expert advice.
Safety and Compliance
The Wall Sleeve - Ø 125mm is engineered to meet the rigorous standards set out in modern building regulations. Its robust construction and insulation properties mean that it not only performs effectively but also contributes significantly to overall fire safety. The product’s HETAS Approval and CE marking are testaments to its high quality and compliance with industry safety standards. This makes it a dependable choice for homeowners and installers looking to ensure that their chimney system operates without risking fire hazards or compromising on performance.
Optional Accessories to Enhance Your Installation
While the Wall Sleeve - Ø 125mm is an exemplary product in its own right, consider exploring additional accessories that might enhance your overall chimney installation. Items such as custom flue liners, decorative chimney caps, and specialized insulation kits can further increase the performance and appearance of your system. These accessories work synergistically with the wall sleeve to provide a comprehensive and integrated solution, ensuring efficiency, longevity, and enhanced safety. Should you require more detailed information or tailored guidance, National Flues is happy to assist you in selecting the right combination of accessories to perfectly suit your needs.
Durability and Maintenance Considerations
The durability of the Wall Sleeve is predominantly attributed to its high-quality stainless steel components. Regular maintenance is recommended to ensure it remains in optimal condition. Simple inspections can verify that no corrosion or structural damage has occurred over time. In addition, ensuring that any modifications—such as tapering for a flush fit—are executed cleanly will extend the product’s life. Routine cleaning and inspections are also advisable to maintain the overall safety and visual appeal of your chimney system.
Final Thoughts and Decision Making
Choosing the right components for your chimney installation is a decision that should never be taken lightly. With its robust build, exceptional insulation capabilities, and adherence to critical safety standards, the Wall Sleeve - Ø 125mm stands out as a top choice for homeowners and professionals alike. This reliable accessory not only improves the safety of your chimney but also enhances the overall aesthetic and structural integrity of your installation. Remember that investing in quality now means fewer problems and repairs in the future.
The Wall Sleeve - Ø 125mm is a testament to National Flues' commitment to quality, safety, and innovation. Crafted from premium materials and designed for ease of installation, it offers a perfect blend of form and function. Whether you are a seasoned installer or a first-time homeowner, this product provides the security and performance required for modern chimney systems. Don’t compromise on safety or quality—ensure your chimney installation is completed with components that you can trust. Buy now or call 01670 206 999.
Invest in safety and efficiency – secure your Wall Sleeve today!
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