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Non-concentric increaser 2 diameters - Ø 100 (3-100-104)

National Flues presents the Non-concentric Increaser 2 Diameters - Ø 100, a premium flue adaptor crafted from 316L Stainless Steel. This essential component seamlessly increases the diameter of your flue system while preventing condensate pooling. Whether you are upgrading a commercial chimney or enhancing a residential ventilation system, this versatile, CE marked accessory meets EN 1856-1 standards, ensuring safety and performance. Enhance your installation with optional accessories to achieve Read more...
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At a Glance

    Constructed from high-grade 316L Stainless Steel
    Versatile use in both high and low-temperature flue applications
    Push-fit jointing system with a secure Locking Band
    Designed to prevent condensate pooling in inclined runs
    CE marked and compliant with EN 1856-1 standards
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, June 24th. 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 2 diameters - Ø 100 is an essential component in the SWPro modular single wall flue system, built from 316 grade stainless steel with a durable high-pressure sealing gasket P1/H1. This increaser is versatile, fitting seamlessly into both high and low-temperature applications, whether condensing or non-condensing, handling both positive and negative pressure flue gasses. Ideal for boilers, ovens, ventilation systems, and chimney shaft liners, this product ensures a reliable and robust connection between flue sections.

The high-quality 316L Stainless Steel varies in thickness depending on the flue diameter, ensuring strength and longevity. The SWPro system meets CE mark standards and is designed as per EN 1856-1 regulations for multiple diameter options. The push-fit jointing system secured with a Locking Band makes installation straightforward.

It’s crucial to incorporate jointing gaskets for P1 and H1 installations and maintain a 50mm distance from any combustible materials.

SKU: 3-100-104

Technical Specifications
Material316L Stainless Steel
Installation SystemPush-fit jointing secured with Locking Band
Sealing GasketHigh-pressure sealing gasket for P1/H1 installations
ComplianceCE Marked, EN 1856-1 standard
Diameter RangeDesigned for u00d8 80 up to u00d8 200 and u00d8 250 up to u00d8 400 configurations
Temperature RangeSuitable for both high and low-temperature applications
Fuel CompatibilityGas and Oil systems
Minimum Combustible Distance50mm
Warranty10 Years
SystemSWPro modular single wall flue system
For optimal performance, ensure the use of the recommended jointing gaskets at every connection point, specifically for P1 and H1 installations. The push-fit system, secured by a Locking Band, simplifies installation; however, careful alignment is essential to maintain integrity. Always maintain a minimum distance of 50mm between the flue and any combustible material to comply with safety standards. It is advisable to check that all components are free from defects and correctly assembled before applying operational pressures. Optional accessories such as additional jointing gaskets, extra Locking Bands, or specialised installation aids may further enhance your installation’s security and efficiency. Always refer to the manufacturer's guidelines for any specific installation nuances.

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

Yes, it is versatile and suitable for a wide range of applications including boilers, ovens, ventilation systems, and as a chimney shaft liner.

A minimum distance of 50mm should be maintained from the outside of the flue to any combustible material such as wood or plasterboard.

Yes, the SWPro system, including this increaser, is CE marked and adheres to EN 1856-1 regulations.

It uses a push-fit jointing system secured by a Locking Band. For P1 and H1 installations, jointing gaskets must be used at every joint.

The system is suitable for both high and low-temperature applications, whether condensing or non-condensing.

The jointing system includes a high-pressure sealing gasket and is secured with a Locking Band for a robust and secure connection.

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