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Increaser 2 diameters - Ø 650 (3-650-102)

At National Flues, our Increaser 2 Diameters - Ø 650 is engineered to provide a reliable, efficient solution for expanding your flue system. Constructed from robust 316L stainless steel, this adapter is ideal for both commercial and residential applications. Whether you are upgrading a boiler system, enhancing oven efficiency, or ensuring top performance in your ventilation system, this product offers versatility and safety. Explore our range of quality flue components and accessories to achieve the optimal setup for your project.
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At a Glance

  • Premium 316L stainless steel construction
  • Suitable for both high and low temperature applications
  • CE marked and EN 1856-1 compliant for safety and quality
  • Versatile design ideal for boilers, ovens, ventilation systems, and chimney shaft liners
  • Quick installation with a secure push-fit joint and locking band
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Thursday, August 14th. This is based on current lead times for this product. 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 on 01670 206 999. 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.

Best 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 Increaser 2 diameters - Ø 650 is a versatile component within the SWPro modular single wall flue system. Constructed from premium 316L stainless steel, this increaser excels in both high and low temperature environments, suitable for non-condensing and condensing applications. The unit features a high-pressure sealing gasket (P1/H1) ensuring a secure fit and outstanding performance.

Ideal for a myriad of uses such as boilers, ovens, ventilation systems, and chimney shaft liners, the Increaser 2 diameters - Ø 650 adheres to stringent safety and quality standards. It’s CE marked and complies with EN 1856-1 specifications. Installation is straightforward thanks to the push-fit jointing system, secured by a locking band.

Remember to maintain a minimum 50mm distance from combustible materials to guarantee safety.

SKU: 3-650-102

Technical Specifications
Model3-650-102
SKU3-650-102
Inner Material316L Stainless Steel
ComplianceCE Marked, EN 1856-1
ApplicationsBoilers, Ovens, Ventilation Systems, Chimney Shaft Liners
Temperature SuitabilityHigh and Low Temperature Environments
Distance To CombustiblesMinimum 50mm
Installation TypePush-fit Joint with Locking Band
Warranty10 Years
Installation is straightforward with the push-fit jointing system provided. Begin by ensuring the component fits securely within your existing flue system. Always install jointing gaskets at each connection point for both P1 and H1 installations. Use the locking band to secure the assembly and avoid any potential movement. Critically, maintain a minimum 50mm clearance from any combustible materials such as wood, plasterboard, or insulation. This distance is mandatory to prevent any fire risks. Follow local guidelines and manufacturer recommendations carefully to ensure a safe and efficient installation.

This increaser is made from high-grade 316L stainless steel, ensuring durability and long-lasting performance.

Yes, this product is CE marked and complies with EN 1856-1 standards.

Absolutely. This increaser is versatile and suitable for both high and low temperature applications, including non-condensing and condensing settings.

Installation is easy with the push-fit jointing system, secured together using a locking band. Be sure to install jointing gaskets at every joint in P1 and H1 installations.

Ensure a minimum distance of 50mm from the outside of the flue to any combustible materials such as wood or plasterboard.

The Increaser 2 Diameters - Ø 650 is ideal for boilers, ovens, ventilation systems, and chimney shaft liners.

Yes, this increaser is suitable for flue gases in both positive and negative pressure scenarios.

What our experts say!

"The Increaser 2 Diameters - Ø 650 is a top-notch product that excels in versatility and durability. Made from high-grade 316L stainless steel, it’s perfect for both commercial and residential use. National Flues provides dependable nationwide delivery and competitive pricing, making this an excellent choice for retail and trade customers alike."

The Increaser 2 Diameters - Ø 650 is designed to expand the diameter of existing flue system components, ensuring efficiency and safety in both commercial and residential applications.

National Flues is a leading supplier of high-quality fireplaces and flue systems in the UK, committed to providing reliable products at competitive prices. Serving both retail and trade customers nationwide, National Flues ensures secure online payments and dependable delivery.

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