Non-concentric increaser - Ø 650
At a Glance
- Constructed from high-grade 316L stainless steel for exceptional durability
- Suitable for both condensing and non-condensing applications
- CE-marked and compliant with EN 1856-1 standards (T200 H1 W Vm L50040 O(50) and L50050 O(50))
- Designed specifically for inclined flue systems to prevent condensate pooling
- Easy push-fit jointing system secured by a locking band
- Ideal for boilers, ovens, ventilation systems and chimney shaft liners
- Maintains a safe 50mm clearance from combustible materials

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]
- Info
- Specs
- Install
- FAQs
The Non-concentric Increaser Ø 650 is part of the SWPro modular single wall flue system. Constructed from high-grade 316L stainless steel, this increaser features a high-pressure sealing gasket P1/H1, ensuring it is suitable for both high and low temperature, non-condensing, and condensing applications. Perfect for boilers, ovens, ventilation systems, and as a chimney shaft liner, the SWPro system offers unmatched versatility.
This CE-marked product meets stringent standards, including EN 1856-1: T200 H1 W Vm L50040 O(50) and EN 1856-1: T200 H1 W Vm L50050 O(50). The increaser is designed for easy installation with a push-fit jointing system secured by a Locking Band. For P1 and H1 installations, jointing gaskets are required at every joint.
Ensure a 50mm distance from any combustible material for optimal safety.
SKU: 3-650-004
Technical Specifications | |
---|---|
Material | 316L Stainless Steel |
Applicable Standards | EN 1856-1: T200 H1 W Vm L50040 O(50) & L50050 O(50) |
System | SWPro |
Installation Method | Push-fit jointing with locking band; jointing gaskets required at every joint for P1 and H1 installations |
Minimum Clearance | 50mm from combustible materials |
Warranty | 10 Years |
Fuels | Gas, Oil |
Product Dimension | u00d8 650 |
In Stock | OUT OF STOCK |
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, April 29th. If you need faster stove or fireplace delivery please give us a call. We can often 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. Mi-Flex offers a lifetime guarantee. 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. If you find it cheaper within 48 hours, we'll refund the difference.
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National Flues Ltd Verdict
The Non-concentric Increaser Ø 650 is an excellent choice for a wide range of applications. At National Flues, we are rarely beaten on price and offer reliable nationwide delivery. Both retail and trade customers are welcome.
The Non-concentric Increaser Ø 650 is designed to increase the diameter of a flue system in an inclined run, preventing potential condensate pooling and enhancing overall efficiency.
National Flues is a leading supplier of fireplaces and flues across the UK, known for unbeatable prices, reliable delivery, and comprehensive solutions for both retail and trade customers.
