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National Flues presents the premium Screw-FIX Register Plate Increaser - Ø 125-150mm, an innovative accessory engineered for chimneys using MI-FLEX flue liners. This register plate increaser is designed to enhance chimney efficiency and safety by facilitating a smooth transition from a 125mm to 150m Read More...
National Flues presents the premium Screw-FIX Register Plate Increaser - Ø 125-150mm, an innovative accessory engineered for chimneys using MI-FLEX flue liners. This register plate increaser is designed to enhance chimney efficiency and safety by facilitating a smooth transition from a 125mm to 150mm flue diameter, making it an essential upgrade for any home heating system. Enjoy the perfect blend of performance and aesthetics with this high-quality chimney component. Less...
In Stock
£74.99
Give us a call if you find it cheaper and we'll try to price match.
At a Glance
Increases flue diameter from 125mm to 150mm Precision-engineered for MI-FLEX 316 and 904 liners Built-in cover plate conceals installation hole Provides secure, gas-tight connections for enhanced safety Suitable for multiple fuel types including wood, smokeless coal, gas, and oil appliances
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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.
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 Register Plate Increaser - Ø 125-150mm is a precision-engineered component designed for chimneys utilizing MI-FLEX 316 and 904 flexible flue liners. This versatile accessory adapts to varying flue diameters, ensuring a seamless transition from 125mm to 150mm. Conforming to Building Regulations Document J, it must be installed within a masonry chimney and is suitable for wood with <20% moisture, smokeless coal, gas, and oil appliances up to 600°C (T600). The unit features a long tail single wall connection, optimized for secure fitting and gas-tight seals using fire cement, ceramic rope, tape, or high-temperature sealant. Its built-in round cover plate elegantly conceals the installation hole, providing both functionality and aesthetic value.
SKU: 25-125-RPAI
Technical Specifications
Flue Diameter Increase
25mm (from 125mm to 150mm)
Compatible Liner Materials
MI-FLEX 316 and 904 flexible flue liners
Temperature Rating
Up to 600u00b0C (T600 designation)
Installation Requirement
Masonry chimney as per Building Regulations Document J
Sealant Options
Fire cement, ceramic rope, tape, or high-temperature sealant
Connection Type
Long tail single wall connection
Finish
Built-in round cover plate for a neat installation
Before beginning installation, ensure that your masonry chimney is in compliance with Building Regulations Document J. Remove the existing register plate and verify that the surface is clean and free from debris. Fit the Screw-FIX Register Plate Increaser below the register plate, aligning the long tail single wall connection with the flexible flue liner. Secure the accessory using appropriate fixings and apply a high-temperature sealant, such as fire cement, ceramic rope, or tape, to achieve a gas-tight seal. Caution: Do not use on non-masonry structures like timber or plasterboard as this may compromise safety and performance. Always adhere to the manufacturer’s guidelines and consider professional installation to ensure optimal performance and regulatory compliance.
The Screw-FIX Register Plate Increaser enhances your chimney flue by increasing the diameter from 125mm to 150mm, ensuring a smooth and safe transition for your MI-FLEX flue liner system.
This product is suitable for use with wood containing less than 20% moisture, smokeless coal, gas, and oil appliances with temperatures up to 600°C (T600 designation).
The bottom fixings should be installed within the existing masonry chimney. Ensure a gas-tight seal using fire cement, ceramic rope, tape, or high-temperature sealant, and secure the fixings firmly to both the connecting flue below and the flexible liner above.
Building Regulations Document J mandates that flexible flue liners must be installed within a masonry chimney to ensure safety and compliance. Non-masonry enclosures like timber or plasterboard are not acceptable.
The built-in round cover plate is designed to cleverly hide the installation hole in the register plate, offering a neat and professional finish while maintaining the internal aesthetics of your chimney system.
While specifically optimized for MI-FLEX 316 and 904 flexible flue liners, the Screw-FIX Register Plate Increaser may be compatible with other brands, provided they have matching specifications.
Yes, professional installation is recommended to ensure compliance with safety regulations and optimal performance of the Screw-FIX Register Plate Increaser within your chimney flue system.
Delivery Information +
We work relentlessly to ensure you get your order fast.
Estimated delivery for this product is Wednesday, May 21st. 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 Screw-FIX Register Plate Increaser - Ø 125-150mm
When it comes to improving the efficiency and safety of your chimney system, the choice of components is crucial. The Screw-FIX Register Plate Increaser is designed to increase your flue diameter from 125mm to 150mm, creating a seamless, reliable transition that enhances the overall performance of your chimney flue. In this comprehensive guide, we explore the critical aspects of selecting and installing this vital accessory, ensuring you have all the information needed to make an informed purchase.
Understanding the Purpose and Benefits
The primary function of the Screw-FIX Register Plate Increaser is to facilitate a secure and efficient transition between different flue diameters. Specifically engineered for use with MI-FLEX 316 and 904 flexible flue liners, this accessory ensures that your chimney system maintains a consistent exhaust flow. Key benefits include:
- Improved chimney efficiency due to the optimised transition from 125mm to 150mm.
- Enhanced safety with a robust, gas-tight seal when paired with the correct high-temperature sealant.
- A visually appealing finish thanks to the built-in cover plate that conceals the installation hole.
Why Choose a Quality Increaser?
Investing in a high-quality register plate increaser is essential for maintaining the longevity of your chimney system. A precise fit not only enhances performance but also reduces the risk of leaks and potential hazards associated with improper flue connections. The Screw-FIX Register Plate Increaser is crafted with precision engineering in mind, ensuring that every component adheres to strict quality standards. This reliability is particularly crucial for those who rely on wood with low moisture levels, smokeless coal, gas, or oil appliances – all of which demand rigorous performance standards.
Key Considerations When Purchasing
Before making a purchase, consider the following factors:
1. Compatibility: Verify that your flue liner system is designed for use with MI-FLEX 316 or 904. The increaser’s design is specifically tailored to these materials, ensuring optimal performance.
2. Installation Environment: Ensure that your chimney is a masonry structure, as required by Building Regulations Document J. Non-masonry installations can compromise the performance and safety of your system.
3. Temperature Ratings: Check that your appliance’s temperature does not exceed 600°C, which aligns with the T600 designation of our product. This is vital for maintaining the integrity of the register plate increaser over time.
4. Sealant Options: The product requires a secure, gas-tight seal. Therefore, it is important to use the correct sealants such as fire cement, ceramic rope, tape, or high-temperature sealant during installation.
Step-by-Step Installation Process
Step 1: Preparation
Begin by inspecting your existing chimney setup. Remove any debris and ensure that the area where the register plate increaser will be installed is clean and clear. Verify that the masonry structure of your chimney complies with required building standards.
Step 2: Positioning the Increaser
With the original register plate removed, position the Screw-FIX Register Plate Increaser at the base of the chimney. The long tail single wall connection should align perfectly with your flexible flue liner. This alignment is key to achieving a secure fit.
Step 3: Securing the Connection
Utilise appropriate fixings to secure the increaser in place. Apply a generous amount of high-temperature sealant – such as fire cement, ceramic rope, or tape – around the edges to ensure a gas-tight seal. This step cannot be overlooked, as it is crucial for both safety and efficiency.
Step 4: Final Adjustments
Once the sealant has been applied and the increaser is securely in position, reinstall the register plate. The built-in cover plate is designed to neatly conceal the installation hole, providing an aesthetically pleasing finish. Double-check all connections and ensure that the increaser is firmly in place before concluding the process.
Frequently Asked Questions
Many customers wonder if professional installation is necessary. While the Screw-FIX Register Plate Increaser is designed for ease of installation, professional assistance is recommended to guarantee compliance with safety regulations and achieve the optimal performance from your flue system. Additionally, questions regarding compatibility with different types of fuels or liners are common. Rest assured that this product is tested and approved for use with multiple fuel types, provided the correct installation guidelines are followed.
Overcoming Common Objections
Cost Considerations: While some may view the initial investment as a concern, consider the long-term benefits of enhanced safety, improved chimney efficiency, and compliance with building regulations. The durability and functionality of this register plate increaser make it a cost-effective solution in the long run.
Installation Complexity: For those worried about the installation process, comprehensive installation instructions are provided, and professional installation services are available. The peace of mind that comes with a correctly installed accessory is invaluable.
Performance and Safety: With stringent quality controls and precise engineering, the Screw-FIX Register Plate Increaser offers a performance that directly translates to increased safety and operational efficiency. Choosing this product means investing in a solution that helps prevent potential hazards and maintains the integrity of your chimney system over time.
Final Thoughts
The Screw-FIX Register Plate Increaser - Ø 125-150mm is not just an accessory; it’s a critical component to ensuring that your chimney system operates safely and efficiently. By bridging the gap between different flue diameters, it enhances both functionality and aesthetics. With its robust construction, compatibility with a range of fuel types, and a secure, gas-tight seal, this product meets the stringent demands required for modern chimney installations. Upgrade your system to experience greater reliability and improved performance.
For anyone seeking a practical yet elegant solution for chimney upgrades, this register plate increaser is the answer. It not only guarantees a perfect fit and finish but also ensures regulatory compliance with Building Regulations Document J. When making your decision, consider investing in superior quality and enhanced safety for your home. Every aspect of its design has been carefully considered to provide you with a product that meets both your practical and aesthetic needs.
Enhance your chimney system with confidence and ensure long-term performance and safety. buy now or call 01670 206 999.
Secure your Screw-FIX Register Plate Increaser now for a reliable, safe, and professional chimney upgrade.
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