× National Flues
We Won't Be Beaten On Price.
Free Delivery on Orders Over £100
100% 5 Star Reviews on Trustpilot
Free Flue Design Service Available
Need Help? 01670 206999 (8am-5pm)

Increaser 2 diameters - Ø 450 (3-450-102)

National Flues proudly presents the Increaser 2 Diameters - Ø 450, a superior flue accessory engineered to bridge different diameters flawlessly. Made from robust 316L stainless steel and adhering to CE standards, this modular component is ideal for both condensing and non-condensing applications, ensuring that your flue system performs at its peak efficiency.
Hover to Zoom / Click for Gallery
£384.99
with free delivery Give us a call if you find it cheaper and we'll try to price match.

 

Payment Options

At a Glance

  • Modular design for smooth diameter transitions
  • Crafted from durable 316L stainless steel
  • CE marked and compliant with EN 1856-1 standards
  • High-pressure sealing gasket (P1/H1) for leak-free installation
  • Suitable for both condensing and non-condensing applications
  • Versatile compatibility with gas and oil fuel systems
  • Maintains essential 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]

The Increaser 2 diameters - Ø 450 from our SWPro line is a modular single-wall flue system, expertly crafted to ensure seamless transitions between different diameters. Constructed from high-quality 316L grade stainless steel, it features a high-pressure sealing gasket (P1/H1) making it suitable for high and low temperature applications, as well as non-condensing and condensing flue gases in both positive and negative pressure environments. It is an ideal choice for various configurations including boilers, ovens, ventilation systems, and as a chimney shaft liner.

SWPro is a trusted and CE-marked system conforming to EN 1856-1 standards for multiple diameter ranges. Installation is straightforward due to its push-fit jointing system that locks securely with a Locking Band. Each joint should be fitted with a gasket to ensure a tight seal, and it is crucial to maintain a 50mm gap from the outside of the flue to any combustible material.

SKU: 3-450-102

Technical Specifications
SKU3-450-102
Product NameIncreaser 2 Diameters - u00d8 450
Material316L Stainless Steel
Diameter Rangeu00d880 up to u00d8200 and u00d8250 up to u00d8400
SystemSWPro
Gasket TypeHigh-pressure (P1/H1)
Fuel CompatibilityGas, Oil
ApprovalsCE, EN 1856-1
Clearance50mm from combustible materials
Warranty10 Years
The Increaser 2 Diameters - Ø 450 is engineered for a simple, reliable installation. Use the push-fit joint system and secure each connection with the integrated locking band. Ensure that every joint receives a correctly fitted gasket to achieve a tight seal. It is crucial to maintain a 50mm clearance from any combustible material. For best results, follow the manufacturer’s installation guidelines and local building regulations.

The Increaser 2 Diameters - Ø 450 is used to increase the diameter of the preceding flue system, providing a smooth transition between different sizes to ensure optimal performance.

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

Yes, it is CE marked, adhering to the standards set by EN 1856-1, ensuring it meets all necessary safety and performance guidelines.

The system features a push-fit jointing mechanism secured with a Locking Band. For P1 and H1 installations, all joints must be fitted with gaskets, and a 50mm clearance from any combustible material must be maintained.

Yes, it is designed to handle both positive and negative pressure conditions, suitable for various high and low temperature flue gas applications.

This increaser specifically covers transitions up to Ø 450, making it versatile for a range of installations.

Yes, the Increaser 2 Diameters - Ø 450 is suitable for both non-condensing and condensing applications, providing great flexibility for different system setups.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Wednesday, April 30th. 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 on a retail basis. Give us a call if you find it cheaper and want to buy from us.

Read our review in our Increaser 2 diameters - Ø 450 buyers guide

Invest in the Increaser 2 Diameters - Ø 450 today and secure a more efficient, safe, and robust flue system.

Your recently viewed products:

Multiple Payment Options- including Klarna, Clearpay, Mastercard, Visa and Paypal