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Non-concentric increaser 3 diameters - Ø 200 (3-200-204)

National Flues presents the Non-Concentric Increaser 3 Diameters - Ø 200, a state-of-the-art modular component designed for superior flue system adaptation. Made from premium 316L stainless steel and CE certified under EN 1856-1, this increaser is ideal for enhancing the performance of boilers, ovens, and ventilation systems. The push-fit, locking band installation system ensures a secure, leak-proof connection while complying with stringent safety regulations. Optimize your chimney liner and fl Read more...
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At a Glance

    Modular design increases flue diameter in three stages
    Constructed from durable 316L stainless steel
    High-pressure sealing gasket (P1/H1) ensures leak-proof performance
    Easy push-fit joint system with secure locking bands
    CE marked and certified under EN 1856-1
    Suitable for boilers, ovens, and ventilation systems
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Monday, June 16th. 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.

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

The Non-concentric increaser 3 diameters - Ø 200 is a highly versatile modular component from the SWPro range, designed to effortlessly increase flue diameter over three increments. Constructed from durable 316L grade stainless steel, it ensures long-lasting performance in a variety of applications including boilers, ovens, chimney liners, and ventilation systems. The high-pressure sealing gasket P1/H1 guarantees secure and leak-proof joints, fit for both high and low temperature operations, as well as non-condensing and condensing conditions.

The SWPro system is CE marked, certified under EN 1856-1 standards, ensuring compliance and safety for both domestic and commercial installations. This increaser features a push-fit jointing system with locking bands for easy and quick assembly. For P1 and H1 installations, joint gaskets must be included at every joint, with a mandated 50mm distance from any combustible materials.

SKU: 3-200-204

Technical Specifications
ModelNon-concentric increaser 3 diameters - u00d8 200
Materials316L Stainless Steel (Inner)
CertificationCE, EN 1856-1
SealingHigh-pressure gasket (P1/H1)
Jointing SystemPush-fit with locking bands
Temperature RangeSuitable for high and low temperature operations
CompatibilityBoilers, ovens, chimney liners, ventilation systems
Clearance Requirement50mm from combustible materials
Warranty10 Years
SystemSWPro
Before installation, ensure that all required joint gaskets are on hand and review the manufacturer’s guidelines thoroughly. The push-fit joint system with locking bands is designed for quick assembly; however, care must be taken during installation. Always maintain a minimum 50mm distance from any combustible materials to prevent fire hazards. It is strongly recommended that installation is carried out by a qualified professional familiar with SWPro systems and local building regulations. Precise measurements, secure fittings, and adherence to safety protocols are essential to achieve optimal performance.

The primary function of the Non-Concentric Increaser is to increase the flue system diameter across three stages while preventing condensate pooling.

Yes, it is suitable for a wide range of applications, including commercial and residential uses such as boilers, ovens, and ventilation systems.

It is constructed from high-grade 316L stainless steel, known for its durability and resistance to corrosion.

The increaser is CE marked and certified under the EN 1856-1 standard, ensuring high-quality and safety.

The increaser uses a modular push-fit jointing system secured with locking bands. In P1 and H1 installations, joint gaskets must be fitted on every connection.

Ensure a 50mm distance from any combustible materials such as wood or plasterboard to prevent fire hazards.

Yes, it is designed for both positive and negative pressure systems, making it highly versatile.

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