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Reducer 2 diameters - Ø 150 (3-125-108)

National Flues offers the Reducer 2 Diameters - Ø 150, a top-tier flue system accessory that enhances both commercial and residential installations. Made from robust 316L stainless steel and compliant with CE and EN 1856-1 standards, this premium reducer is not only designed for safety but also for superior performance. Compatible with gas and oil systems, it serves as the essential link in creating an efficient, high-performance flue system while perfectly complementing other accessories availa Read more...
The price you pay today £106.99
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At a Glance

    Constructed from premium 316L Stainless Steel
    Modular design suited for both residential and commercial applications
    Push-fit jointing system with secure locking band
    CE marked and compliant with EN 1856-1 standards
    Efficient diameter reduction for optimal flue performance
    Designed to handle varying temperature and pressure conditions
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, June 20th. 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.

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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.

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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).

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

The Reducer 2 diameters - Ø 150 is a high-quality, modular component designed to decrease the diameter of your flue system efficiently. Crafted from top-tier 316L grade stainless steel, this reducer is ideal for both commercial and residential applications. With CE marking and conforming to EN 1856-1 standards, it guarantees reliability and safety.

The SWPro modular design features a high-pressure sealing gasket (P1/H1) suitable for various applications, including boilers, ovens, ventilation systems, and chimney shaft liners, handling both high and low-temperature environments, as well as positive and negative pressure scenarios. Installation is straightforward with the push-fit jointing system and secure locking band, ensuring a hassle-free setup. Ensure a 50mm distance from any combustible materials to maintain safety.

SKU: 3-125-108

Technical Specifications
Material316L Stainless Steel
CertificationCE, EN 1856-1
SystemSWPro
ApplicationCommercial / Residential Flue Systems
InstallationPush-fit jointing with secure locking band; requires 50mm clearance from combustibles
Fuel CompatibilityGas, Oil
Warranty10 Years
Follow the included push-fit installation guidelines. Ensure that each joint is fitted with the appropriate sealing gasket (P1/H1) to maintain optimal pressure and efficiency. Maintain a minimum 50mm clearance from any combustible materials, such as wood or plasterboard, to meet safety requirements. Align components carefully and secure the locking band tightly into place. For best performance, verify all connections and seals post-installation before use.

The reducer is designed to decrease the diameter of your flue system, ensuring compatibility and optimal performance across varying sections.

Yes, this reducer is ideal for both residential and commercial applications, including boilers, ovens, ventilation systems, and chimney shaft liners.

This reducer is made from high-grade 316L Stainless Steel, ensuring durability and longevity.

Yes, the reducer is CE marked and conforms to EN 1856-1 standards, indicating compliance with essential safety and performance requirements.

The reducer features a push-fit jointing system and a secure locking band for straightforward installation. Ensure to fit jointing gaskets on every joint in P1 and H1 installations for optimal performance.

Yes, this reducer is suitable for both high and low-temperature applications, as well as for handling both condensing and non-condensing flue gases.

Ensure a 50mm distance from any combustible materials, such as wood or plasterboard, to maintain safety standards.

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