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Increaser 3 diameters - Ø 600 (3-600-202)

National Flues presents the Increaser 3 Diameters - Ø 600, a premium flue diameter increaser designed for modern installations. Perfect for expanding your existing flue system, this product is versatile enough for boilers, ovens, and ventilation setups. Engineered from 316L stainless steel, our modular system not only emphasises durability but also delivers unmatched performance in both condensing and non-condensing environments. Trust National Flues for reliable, CE-approved chimney accessories Read more...
The price you pay today £1,232.99
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At a Glance

    Modular single wall flue design
    Constructed in high-grade 316L stainless steel
    High-pressure sealing gasket P1/H1 for both condensing and non-condensing setups
    CE approved and compliant with EN 1856-1 standards
    Versatile use with boilers, ovens, ventilation systems and chimney liners
    Push-fit jointing system secured by a locking band to ensure reliable sealing
    Maintains a safe 50mm clearance from combustible materials
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, June 13th. 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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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.
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  • 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 Increaser 3 diameters - Ø 600 is part of our SWPro range, a modular single wall flue system crafted from 316 grade stainless steel with a high-pressure sealing gasket P1/H1. This increaser is perfect for adjusting flue diameters effectively in both high and low temperature settings, whether condensing or non-condensing. Ideal for commercial applications, it suits boilers, ovens, ventilation systems, and chimney liners.

Constructed with high-grade 316L stainless steel, the SWPro system ensures durability and compliance with strict CE standards. Installation is streamlined with a push-fit jointing system secured by a locking band, maintaining safety by requiring a 50mm clearance from combustible materials.

SKU: 3-600-202

Technical Specifications
SKU3-600-202
Dimensionsu00d8 600 mm
Material316L Stainless Steel
SystemSWPro Modular Single Wall Flue
Pressure RatingHigh-pressure sealing gasket P1/H1
ApprovalsCE Approved, EN 1856-1 Compliant
Safety Clearance50mm from combustible materials
Warranty10 Years
ApplicationsCondensing and non-condensing systems, boilers, ovens, ventilation systems, chimney liners
• Ensure installation in accordance with local regulations and manufacturer guidelines. • Use the push-fit jointing system and secure each connection with the locking band for optimal performance. • For high-pressure installations, fit jointing gaskets on every joint as required. • Maintain at least a 50mm clearance from any combustible materials to ensure safety. • Inspect the system after installation to confirm all components are securely fitted and compliant with safety standards.

This increaser is mainly used to expand the diameter of an existing flue system, ensuring it can handle higher volumes of flue gases or adapt to different equipment requirements.

It's made from high-grade 316L stainless steel, renowned for its durability and resistance to corrosion.

Yes, the SWPro system includes a high-pressure sealing gasket P1/H1, making it suitable for both positive and negative pressure scenarios.

Yes, the increaser features a push-fit jointing system secured by a locking band, and in high-pressure installations, jointing gaskets must be fitted on every joint.

You must maintain a 50mm clearance from any combustible material, such as wood or plasterboard.

The increaser meets the EN 1856-1 standards and holds a CE marking, ensuring it adheres to stringent European safety and quality regulations.

Yes, it is versatile enough to be used in both condensing and non-condensing applications, adapting perfectly to various flue gas conditions.

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