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Reducer - Ø 400 (3-300-008)

The National Flues Reducer - Ø 400 is the perfect flue system adapter for customers demanding quality and durability. Engineered from robust 316L stainless steel, this adapter is designed to seamlessly integrate with both non-condensing and condensing systems. CE marked and compliant with EN 1856-1 standards, our product is essential for applications in boilers, ovens, and ventilation systems throughout the UK.
The price you pay today £286.99
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At a Glance

    Crafted from high-grade 316L Stainless Steel
    Compatible with the SWPro modular single wall system
    Supports both non-condensing and condensing operations
    CE marked with EN 1856-1 specifications
    Easy push-fit joint installation secured by a Locking Band
    Maintains crucial 50mm clearance from combustible materials
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, June 17th. This is based on current delivery times for this product. Delivery for products not in our warehouses can be delayed because of third party carriers. If you need a stove, or other bulky product, to be delivered by a specific time in the next 7 days then please 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 and you can read in our blog about they types and terms and conditions for warranties. Mi-Flex flue liner, for example, comes with a lifetime guarantee. Give us a call if you want to know about a specific warranty. 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.

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.

Have Questions?
Phone: 01670 206999
Email: [email protected]

The Reducer - Ø 400 is a concentric adapter designed to effectively decrease the diameter of your existing flue system. Crafted from high-grade 316L stainless steel, this product offers exceptional durability and performance. The SWPro modular single wall flue system is suitable for a wide range of applications including boilers, ovens, ventilation systems, and chimney shafts.

It supports both non-condensing and condensing operations, handling both high and low temperatures and flue gases in positive and negative pressure. The system features a high-pressure sealing gasket (P1/H1) and is CE marked with Designation Number EN 1856-1: T200 H1 W Vm L50050 O(50) for diameters up to Ø 400. Installation is straightforward with a push-fit jointing system that secures using a Locking Band.

Safety is paramount, so it's crucial to maintain a 50mm distance from any combustible materials.

SKU: 3-300-008

Technical Specifications
Material316L Stainless Steel
DesignationEN 1856-1: T200 H1 W Vm L50050 O(50)
Diameter Rangeu00d8 80 up to u00d8 400
SystemSWPro
ApplicationsBoilers, ovens, ventilation systems, chimney shafts
Pressure GasketHigh-pressure sealing gasket (P1/H1)
Warranty10 Years
Clearance50mm from combustibles
ApprovalsCE Marked
Install the Reducer - Ø 400 using the straightforward push-fit jointing system. Ensure the connection is secured with the provided Locking Band. Pay attention to the 50mm clearance requirement from any combustible materials during installation. For optimum performance, consider using optional accessories such as additional sealing gaskets, expansion joints, or adapter extensions to create a tailored, leak-proof system. Always refer to the installation manual and local regulations to ensure safety and compliance.

The Reducer - Ø 400 is made from high-grade 316L stainless steel, ensuring exceptional durability and performance.

Yes, the Reducer - Ø 400 is CE marked with Designation Number EN 1856-1: T200 H1 W Vm L50050 O(50).

The Reducer - Ø 400 is suitable for a wide range of applications, including boilers, ovens, ventilation systems, and chimney shaft liners.

The Reducer - Ø 400 should be installed as part of the SWPro modular flue system, using a push-fit jointing system secured with a Locking Band. Ensure a 50mm distance from any combustible materials.

Yes, the Reducer - Ø 400 is designed to handle both high and low temperature applications, making it very versatile.

Yes, the Reducer - Ø 400 supports both non-condensing and condensing operations.

The high-pressure sealing gasket (P1/H1) ensures a secure and leak-proof connection within the flue system, maintaining the integrity of your setup.

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